| Nominal | 21668 |
| Cardinal | twenty-one thousand six hundred sixty-eight |
Cardinal twenty-one thousand six hundred sixty-eight | |
| Ordinal | 21,668th |
| Number of digits | 5 |
| Sum of digits | 23 |
| Product of digits | 576 |
| Number parity | Even |
| Prime factorization | 2 x 2 x 5417 |
| Prime factorization in exponent form | 22 x 5417 |
| Prime factors | 2, 5417 |
| Number of distinct prime factors ω(n) | 2 |
| Total number of prime factors Ω(n) | 3 |
| Sum of prime factors | 5419 |
| Product of prime factors | 10834 |
| Is 21668 a prime number? | No |
| Is 21668 a semiprime number? | No |
| Is 21668 a Chen prime number? | No |
| Is 21668 a Mersenne prime number? | No |
| Is 21668 a Catalan number? | No |
| Is 21668 a Fibonacci number? | No |
| Is 21668 a Idoneal number? | No |
| Square of 21668 (n2) | 469502224 |
| Cube of 21668 (n3) | 10173174189632 |
| Square root of 21668 | 147.20054347726 |
| Natural Logarithm (ln) of 21668 | 9.9835917967778 |
| Decimal Logarithm (log) of 21668 | 4.3358188269152 |
| Sine of 21668 | -0.42183494373368 |
| Cosecant of 21668 | -2.3705954541105 |
| Cosine of 21668 | -0.90667264227239 |
| Secant of 21668 | -1.1029339073182 |
| Tangent of 21668 | 0.46525606273553 |
| Cotangent of 21668 | 2.1493540441373 |
| The spelling of 21668 in words is "twenty-one thousand six hundred sixty-eight", meaning that: |
| 21668 is not an aban number (as it contains the letter a) |
| 21668 is not an eban number (as it contains the letter e) |
| 21668 is not an iban number (as it contains the letter i) |
| 21668 is not an oban number (as it contains the letter o) |
| 21668 is not a tban number (as it contains the letter t) |
| 21668 is not an uban number (as it contains the letter u) |
| Bengali numerals | ২১৬৬৮ |
| Eastern Arabic numerals | ٢١٬٦٦٨ |
| Hieroglyphs numeralsused in Ancient Egypt | 𓂭𓂭𓆼𓍧𓎋𓐁 |
| Khmer numerals | ២១៦៦៨ |
| Japanese numerals | 二万千六百六十八 |
| Roman numerals | n/a |
| Thai numerals | ๒๑๖๖๘ |
| Arabic | واحد و عشرون ألف و ستة مائة و ثمانية و ستون |
| Croatian | dvadeset i jedna tisuća šeststo šezdeset i osam |
| Czech | dvacet jedna tisíc šest set šedesát osm |
| Danish | en og tyve tusinde seks hundrede otte og tres |
| Dutch | éénentwintigduizend zeshonderdachtenzestig |
| Estonian | akpe blaeve vɔ ɖekɛ alafa ade blaade vɔ enyi |
| Faroese | tjúgoeitt tusin og sekshundraðogsekstiátta |
| Filipino | dalawáng pû’t isáng libó’t anim na daán at anim na pû’t waló |
| Finnish | kaksikymmentäyksituhattakuusisataakuusikymmentäkahdeksan |
| French | vingt et un mille six cent soixante-huit |
| Greek | είκοσι μία χίλιάδες εξακόσια εξήντα οκτώ |
| German | einundzwanzigtausendsechshundertachtundsechzig |
| Hebrew | עשרים ואחד אלף שש מאות שישים ושמונה |
| Hindi | इक्कीस हज़ार छह सौ अड़सठ |
| Hungarian | huszonegyezerhatszázhatvannyolc |
| Icelandic | tuttugu og eitt þúsund og sexhundrað og sextíu og átta |
| Indonesian | dua puluh satu ribu enam ratus enam puluh delapan |
| Italian | ventunomilaseicentosessantotto |
| Japanese | 二万千六百六十八 |
| Korean | 이만 천육백육십팔 |
| Latvian | divdesmit viens tūkstoši sešsimt sešdesmit astoņi |
| Lithuanian | dvidešimt vienas tūkstantis šeši šimtai šešiasdešimt aštuoni |
| Norwegian | tjueett tusen seks hundre og sekstiåtte |
| Persian | بیست و یک هزار و ششصد و شصت و هشت |
| Polish | dwadzieścia jeden tysięcy sześćset sześćdziesiąt osiem |
| Portuguese | vinte e um mil seiscentos e sessenta e oito |
| Romanian | douăzeci şi una mii şase sute şasezeci şi opt |
| Russian | двадцать одна тысяча шестьсот шестьдесят восемь |
| Serbian | двадесет и једна хиљада шестсто шездесет и осам |
| Slovak | dvadsaťjedna tisíc šesťsto šesťdesiatosem |
| Slovene | dvaset ena tisuću šesto šestdeset osem |
| Spanish | veintiún mil seiscientos sesenta y ocho |
| Swahili | elfu ishirini na moja, mia sita na sitini na nane |
| Swedish | tjugoentusensexhundrasextioåtta |
| Thai | สองหมื่นหนึ่งพันหกร้อยหกสิบแปด |
| Turkish | yirmi bir bin altı yüz altmış sekiz |
| Ukrainian | двадцять одна тисяча шістсот шістдесят вісім |
| Vietnamese | hai mươi mốt nghìn sáu trăm sáu mươi tám |
| Number 21668 reversed | 86612 | |
| Unicode Character | U+54A4 | 咤 |
| Unix Timestamp | Thu, 01 Jan 1970 06:01:08 +0000 | |