21681

Number 21681 is an odd five-digits composite number and natural number following 21680 and preceding 21682.

Properties of the number 21681

Nominal	21681
Cardinal	twenty-one thousand six hundred eighty-one
Cardinal twenty-one thousand six hundred eighty-one
Ordinal	21,681st
Number of digits	5
Sum of digits	18
Product of digits	96
Number parity	Odd

Previous number is 21680

Next number is 21682

Calculation was done in 0.0000350475 seconds

Prime Factorization of 21681

Prime factorization	3 x 3 x 3 x 11 x 73
Prime factorization in exponent form	3³ x 11 x 73
Prime factors	3, 11, 73
Number of distinct prime factors ω(n)	3
Total number of prime factors Ω(n)	5
Sum of prime factors	87
Product of prime factors	2409

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Divisors of 21681

List of proper divisors	1, 3, 9, 11, 27, 33, 73, 99, 219, 297, 657, 803, 1971, 2409, 7227
List of all dividers	1, 3, 9, 11, 27, 33, 73, 99, 219, 297, 657, 803, 1971, 2409, 7227, 21681
Number of divisors d(n)	16
Sum of all divisors σ(n)	35520
Aliquot sum	13839
21681 is a deficient number , since it is larger than the sum of its proper divisors (13839). Its deficiency is 7842.

Calculation was done in 0.0000240803 seconds

Prime numbers

Is 21681 a prime number?	No
Is 21681 a semiprime number?	No
Is 21681 a Chen prime number?	No
Is 21681 a Mersenne prime number?	No

Previous prime is 21673

Next prime is 21683

Calculation was done in 0.0220210552 seconds

Sequences

Is 21681 a Catalan number?	No
Is 21681 a Fibonacci number?	No
Is 21681 a Idoneal number?	No

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Number theory

Number theory is a branch of pure mathematics devoted primarily to the study of the integers and integer-valued functions.

21681 is not a Happy number

21681 is not a Humble number

21681 is not a Münchhausen number

21681 is not a Perfect number

21681 is not a Perfect square

21681 is not a Palindrome

Calculation was done in 0.0048391819 seconds

Numeric Bases of 21681

In mathematics, a base or radix of a numeral system is the number of unique digits, including zero, used to represent numbers in that system.

Base	System	Value
2	Binary	101010010110001₂
3	Ternary	1002202000₃
4	Quaternary	11102301₄
5	Quinary	1143211₅
6	Senary	244213₆
7	Septenary	120132₇
8	Octal	52261₈
9	Nonary	32660₉
10	Decimal	21681
12	Duodecimal	10669₁₂
16	Hexadecimal	54b1₁₆
20	Vigesimal	2e41₂₀
36	Base36	gq9₃₆
60	Sexagesimal	61L₆₀

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Mathematical operations

Mathematical operations are actions that are performed on numbers or mathematical expressions to find a numerical result.

Square of 21681 (n²)	470065761
Cube of 21681 (n³)	10191495764241
Square root of 21681	147.2446943017
Natural Logarithm (ln) of 21681	9.9841915799511
Decimal Logarithm (log) of 21681	4.3360793094377

Calculation was done in 0.0000050068 seconds

Trigonometry

Trigonometry is the study of the relationship between the angles and sides of a triangle.

Sine of 21681	-0.76374671946972
Cosecant of 21681	-1.3093345928796
Cosine of 21681	-0.64551603272052
Secant of 21681	-1.5491481997519
Tangent of 21681	1.183156855533
Cotangent of 21681	0.84519647189936

Calculation was done in 0.0000050068 seconds

Number parity

Parity is the property of an integer of whether it is even or odd.

Is 21681 an Even Number?

Is 21681 an Odd Number?

Yes, the number 21681 is an odd number.

Total number of all odd numbers from 1 to 21681 is 10841

Sum of all the odd numbers from 1 to 21681 are 117527281

The sum of all odd numbers is a perfect square: 117527281 = 10841

An odd number is any integer (a whole number) that cannot be divided by 2 evenly. Odd numbers are the opposite of even numbers.

Previous odd number is 21679

Next odd number is 21683

Calculation was done in 0.0000059605 seconds

Ban number

In recreational mathematics, a ban number is a number that does not contain a particular letter when spelled out in English; in other words, the letter is "banned".

The spelling of 21681 in words is "twenty-one thousand six hundred eighty-one", meaning that:

21681 is not an aban number (as it contains the letter a)

21681 is not an eban number (as it contains the letter e)

21681 is not an iban number (as it contains the letter i)

21681 is not an oban number (as it contains the letter o)

21681 is not a tban number (as it contains the letter t)

21681 is not an uban number (as it contains the letter u)

Calculation was done in 0.0000028610 seconds

Numeral systems

How to write 21681 in other number systems?

Bengali numerals	২১৬৮১
Eastern Arabic numerals	٢١٬٦٨١
Hieroglyphs numeralsused in Ancient Egypt	𓂭𓂭𓆼𓍧𓎍𓏺
Khmer numerals	២១៦៨១
Japanese numerals	二万千六百八十一
Roman numerals	n/a
Thai numerals	๒๑๖๘๑

Calculation was done in 0.0001449585 seconds

Translation

How do you say 21681 in 38 different languages?

Arabic	واحد و عشرون ألف و ستة مائة و واحد و ثمانون
Croatian	dvadeset i jedna tisuća šeststo osamdeset i jedan
Czech	dvacet jedna tisíc šest set osmdesát jeden
Danish	en og tyve tusinde seks hundrede en og firs
Dutch	éénentwintigduizend zeshonderdéénentachtig
Estonian	akpe blaeve vɔ ɖekɛ alafa ade blaenyi vɔ ɖekɛ
Faroese	tjúgoeitt tusin og sekshundraðogáttatiein
Filipino	dalawáng pû’t isáng libó’t anim na daán at walóng pû’t isá
Finnish	kaksikymmentäyksituhattakuusisataakahdeksankymmentäyksi
French	vingt et un mille six cent quatre-vingt-un
Greek	είκοσι μία χίλιάδες εξακόσια ογδόντα ένα
German	einundzwanzigtausendsechshunderteinundachtzig
Hebrew	עשרים ואחד אלף שש מאות שמונים ואחת
Hindi	इक्कीस हज़ार छह सौ इक्यासी
Hungarian	huszonegyezerhatszáznyolcvanegy
Icelandic	tuttugu og eitt þúsund og sexhundrað og áttatíu og einn
Indonesian	dua puluh satu ribu enam ratus delapan puluh satu
Italian	ventunomilaseicentoottantuno
Japanese	二万千六百八十一
Korean	이만 천육백팔십일
Latvian	divdesmit viens tūkstoši sešsimt astoņdesmit viens
Lithuanian	dvidešimt vienas tūkstantis šeši šimtai aštuoniasdešimt vienas
Norwegian	tjueett tusen seks hundre og åttién
Persian	بیست و یک هزار و ششصد و هشتاد و یک
Polish	dwadzieścia jeden tysięcy sześćset osiemdziesiąt jeden
Portuguese	vinte e um mil seiscentos e oitenta e um
Romanian	douăzeci şi una mii şase sute optzeci şi unu
Russian	двадцать одна тысяча шестьсот восемьдесят один
Serbian	двадесет и једна хиљада шестсто осамдесет и један
Slovak	dvadsaťjedna tisíc šesťsto osemdesiatjeden
Slovene	dvaset ena tisuću šesto osemdeset ena
Spanish	veintiún mil seiscientos ochenta y uno
Swahili	elfu ishirini na moja, mia sita na themanini na moja
Swedish	tjugoentusensexhundraåttioen
Thai	สองหมื่นหนึ่งพันหกร้อยแปดสิบเอ็ด
Turkish	yirmi bir bin altı yüz seksen bir
Ukrainian	двадцять одна тисяча шістсот вісімдесят один
Vietnamese	hai mươi mốt nghìn sáu trăm tám mươi mốt

Calculation was done in 0.0140080452 seconds

Miscellaneous

Number 21681 reversed	18612
Unicode Character	U+54B1	咱
Unix Timestamp	Thu, 01 Jan 1970 06:01:21 +0000

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