21661

Number 21661 is an odd five-digits prime number and natural number following 21660 and preceding 21662.

Properties of the number 21661

Nominal	21661
Cardinal	twenty-one thousand six hundred sixty-one
Cardinal twenty-one thousand six hundred sixty-one
Ordinal	21,661st
Number of digits	5
Sum of digits	16
Product of digits	72
Number parity	Odd

Previous number is 21660

Next number is 21662

Calculation was done in 0.0000360012 seconds

Prime Factorization of 21661

Prime factorization	21661
Prime factors	21661
Number of distinct prime factors ω(n)	1
Total number of prime factors Ω(n)	1
Sum of prime factors	21661
Product of prime factors	21661

Calculation was done in 0.0010709763 seconds

Divisors of 21661

List of proper divisors	1
List of all dividers	1, 21661
Number of divisors d(n)	2
Sum of all divisors σ(n)	21662
Aliquot sum	1
21661 is a deficient number , since it is larger than the sum of its proper divisors (1). Its deficiency is 21660.

Calculation was done in 0.0000178814 seconds

Prime numbers

Is 21661 a prime number?	Yes
Is 21661 a semiprime number?	No
Is 21661 a Chen prime number?	No
Is 21661 a Mersenne prime number?	No

Previous prime is 21649

Next prime is 21673

Calculation was done in 0.0834889412 seconds

Sequences

Is 21661 a Catalan number?	No
Is 21661 a Fibonacci number?	No
Is 21661 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.

21661 is not a Happy number

21661 is not a Humble number

21661 is not a Münchhausen number

21661 is not a Perfect number

21661 is not a Perfect square

21661 is not a Palindrome

Calculation was done in 0.0064129829 seconds

Numeric Bases of 21661

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	101010010011101₂
3	Ternary	1002201021₃
4	Quaternary	11102131₄
5	Quinary	1143121₅
6	Senary	244141₆
7	Septenary	120103₇
8	Octal	52235₈
9	Nonary	32637₉
10	Decimal	21661
12	Duodecimal	10651₁₂
16	Hexadecimal	549d₁₆
20	Vigesimal	2e31₂₀
36	Base36	gpp₃₆
60	Sexagesimal	611₆₀

Calculation was done in 0.0000188351 seconds

Mathematical operations

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

Square of 21661 (n²)	469198921
Cube of 21661 (n³)	10163317827781
Square root of 21661	147.17676447048
Natural Logarithm (ln) of 21661	9.983268687541
Decimal Logarithm (log) of 21661	4.3356785023566

Calculation was done in 0.0000061989 seconds

Trigonometry

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

Sine of 21661	0.27764946035632
Cosecant of 21661	3.601663762345
Cosine of 21661	-0.96068245386488
Secant of 21661	-1.0409266828773
Tangent of 21661	-0.28901273177138
Cotangent of 21661	-3.4600551812058

Calculation was done in 0.0000128746 seconds

Number parity

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

Is 21661 an Even Number?

Is 21661 an Odd Number?

Yes, the number 21661 is an odd number.

Total number of all odd numbers from 1 to 21661 is 10831

Sum of all the odd numbers from 1 to 21661 are 117310561

The sum of all odd numbers is a perfect square: 117310561 = 10831

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 21659

Next odd number is 21663

Calculation was done in 0.0000061989 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 21661 in words is "twenty-one thousand six hundred sixty-one", meaning that:

21661 is not an aban number (as it contains the letter a)

21661 is not an eban number (as it contains the letter e)

21661 is not an iban number (as it contains the letter i)

21661 is not an oban number (as it contains the letter o)

21661 is not a tban number (as it contains the letter t)

21661 is not an uban number (as it contains the letter u)

Calculation was done in 0.0000019073 seconds

Numeral systems

How to write 21661 in other number systems?

Bengali numerals	২১৬৬১
Eastern Arabic numerals	٢١٬٦٦١
Hieroglyphs numeralsused in Ancient Egypt	𓂭𓂭𓆼𓍧𓎋𓏺
Khmer numerals	២១៦៦១
Japanese numerals	二万千六百六十一
Roman numerals	n/a
Thai numerals	๒๑๖๖๑

Calculation was done in 0.0001449585 seconds

Translation

How do you say 21661 in 38 different languages?

Arabic	واحد و عشرون ألف و ستة مائة و واحد و ستون
Croatian	dvadeset i jedna tisuća šeststo šezdeset i jedan
Czech	dvacet jedna tisíc šest set šedesát jeden
Danish	en og tyve tusinde seks hundrede en og tres
Dutch	éénentwintigduizend zeshonderdéénenzestig
Estonian	akpe blaeve vɔ ɖekɛ alafa ade blaade vɔ ɖekɛ
Faroese	tjúgoeitt tusin og sekshundraðogsekstiein
Filipino	dalawáng pû’t isáng libó’t anim na daán at anim na pû’t isá
Finnish	kaksikymmentäyksituhattakuusisataakuusikymmentäyksi
French	vingt et un mille six cent soixante et un
Greek	είκοσι μία χίλιάδες εξακόσια εξήντα ένα
German	einundzwanzigtausendsechshunderteinundsechzig
Hebrew	עשרים ואחד אלף שש מאות שישים ואחת
Hindi	इक्कीस हज़ार छह सौ इकसठ
Hungarian	huszonegyezerhatszázhatvanegy
Icelandic	tuttugu og eitt þúsund og sexhundrað og sextíu og einn
Indonesian	dua puluh satu ribu enam ratus enam puluh satu
Italian	ventunomilaseicentosessantuno
Japanese	二万千六百六十一
Korean	이만 천육백육십일
Latvian	divdesmit viens tūkstoši sešsimt sešdesmit viens
Lithuanian	dvidešimt vienas tūkstantis šeši šimtai šešiasdešimt vienas
Norwegian	tjueett tusen seks hundre og sekstién
Persian	بیست و یک هزار و ششصد و شصت و یک
Polish	dwadzieścia jeden tysięcy sześćset sześćdziesiąt jeden
Portuguese	vinte e um mil seiscentos e sessenta e um
Romanian	douăzeci şi una mii şase sute şasezeci şi unu
Russian	двадцать одна тысяча шестьсот шестьдесят один
Serbian	двадесет и једна хиљада шестсто шездесет и један
Slovak	dvadsaťjedna tisíc šesťsto šesťdesiatjeden
Slovene	dvaset ena tisuću šesto šestdeset ena
Spanish	veintiún mil seiscientos sesenta y uno
Swahili	elfu ishirini na moja, mia sita na sitini na moja
Swedish	tjugoentusensexhundrasextioen
Thai	สองหมื่นหนึ่งพันหกร้อยหกสิบเอ็ด
Turkish	yirmi bir bin altı yüz altmış bir
Ukrainian	двадцять одна тисяча шістсот шістдесят один
Vietnamese	hai mươi mốt nghìn sáu trăm sáu mươi mốt

Calculation was done in 0.0143280029 seconds

Miscellaneous

Number 21661 reversed	16612
Unicode Character	U+549D	咝
Unix Timestamp	Thu, 01 Jan 1970 06:01:01 +0000

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