| Nominal | 21664 |
| Cardinal | twenty-one thousand six hundred sixty-four |
Cardinal twenty-one thousand six hundred sixty-four | |
| Ordinal | 21,664th |
| Number of digits | 5 |
| Sum of digits | 19 |
| Product of digits | 288 |
| Number parity | Even |
| Prime factorization | 2 x 2 x 2 x 2 x 2 x 677 |
| Prime factorization in exponent form | 25 x 677 |
| Prime factors | 2, 677 |
| Number of distinct prime factors ω(n) | 2 |
| Total number of prime factors Ω(n) | 6 |
| Sum of prime factors | 679 |
| Product of prime factors | 1354 |
| Is 21664 a prime number? | No |
| Is 21664 a semiprime number? | No |
| Is 21664 a Chen prime number? | No |
| Is 21664 a Mersenne prime number? | No |
| Is 21664 a Catalan number? | No |
| Is 21664 a Fibonacci number? | No |
| Is 21664 a Idoneal number? | No |
| Square of 21664 (n2) | 469328896 |
| Cube of 21664 (n3) | 10167541202944 |
| Square root of 21664 | 147.18695594379 |
| Natural Logarithm (ln) of 21664 | 9.983407175712 |
| Decimal Logarithm (log) of 21664 | 4.3357386470051 |
| Sine of 21664 | -0.4104423980703 |
| Cosecant of 21664 | -2.4363954715729 |
| Cosine of 21664 | 0.91188652685863 |
| Secant of 21664 | 1.096627673012 |
| Tangent of 21664 | -0.45010249190131 |
| Cotangent of 21664 | -2.2217162046267 |
| The spelling of 21664 in words is "twenty-one thousand six hundred sixty-four", meaning that: |
| 21664 is not an aban number (as it contains the letter a) |
| 21664 is not an eban number (as it contains the letter e) |
| 21664 is not an iban number (as it contains the letter i) |
| 21664 is not an oban number (as it contains the letter o) |
| 21664 is not a tban number (as it contains the letter t) |
| 21664 is not an uban number (as it contains the letter u) |
| Bengali numerals | ২১৬৬৪ |
| Eastern Arabic numerals | ٢١٬٦٦٤ |
| Hieroglyphs numeralsused in Ancient Egypt | 𓂭𓂭𓆼𓍧𓎋𓏽 |
| Khmer numerals | ២១៦៦៤ |
| Japanese numerals | 二万千六百六十四 |
| Roman numerals | n/a |
| Thai numerals | ๒๑๖๖๔ |
| Arabic | واحد و عشرون ألف و ستة مائة و أربعة و ستون |
| Croatian | dvadeset i jedna tisuća šeststo šezdeset i četiri |
| Czech | dvacet jedna tisíc šest set šedesát čtyři |
| Danish | en og tyve tusinde seks hundrede fire og tres |
| Dutch | éénentwintigduizend zeshonderdvierenzestig |
| Estonian | akpe blaeve vɔ ɖekɛ alafa ade blaade vɔ ene |
| Faroese | tjúgoeitt tusin og sekshundraðogsekstifýre |
| Filipino | dalawáng pû’t isáng libó’t anim na daán at anim na pû’t ápat |
| Finnish | kaksikymmentäyksituhattakuusisataakuusikymmentäneljä |
| French | vingt et un mille six cent soixante-quatre |
| Greek | είκοσι μία χίλιάδες εξακόσια εξήντα τέσσερα |
| German | einundzwanzigtausendsechshundertvierundsechzig |
| Hebrew | עשרים ואחד אלף שש מאות שישים וארבע |
| Hindi | इक्कीस हज़ार छह सौ चौंसठ |
| Hungarian | huszonegyezerhatszázhatvannégy |
| Icelandic | tuttugu og eitt þúsund og sexhundrað og sextíu og fjórir |
| Indonesian | dua puluh satu ribu enam ratus enam puluh empat |
| Italian | ventunomilaseicentosessantaquattro |
| Japanese | 二万千六百六十四 |
| Korean | 이만 천육백육십사 |
| Latvian | divdesmit viens tūkstoši sešsimt sešdesmit četri |
| Lithuanian | dvidešimt vienas tūkstantis šeši šimtai šešiasdešimt keturi |
| Norwegian | tjueett tusen seks hundre og sekstifire |
| Persian | بیست و یک هزار و ششصد و شصت و چهار |
| Polish | dwadzieścia jeden tysięcy sześćset sześćdziesiąt cztery |
| Portuguese | vinte e um mil seiscentos e sessenta e quatro |
| Romanian | douăzeci şi una mii şase sute şasezeci şi patru |
| Russian | двадцать одна тысяча шестьсот шестьдесят четыре |
| Serbian | двадесет и једна хиљада шестсто шездесет и четири |
| Slovak | dvadsaťjedna tisíc šesťsto šesťdesiatštyri |
| Slovene | dvaset ena tisuću šesto šestdeset štiri |
| Spanish | veintiún mil seiscientos sesenta y cuatro |
| Swahili | elfu ishirini na moja, mia sita na sitini na nne |
| Swedish | tjugoentusensexhundrasextiofyra |
| Thai | สองหมื่นหนึ่งพันหกร้อยหกสิบสี่ |
| Turkish | yirmi bir bin altı yüz altmış dört |
| Ukrainian | двадцять одна тисяча шістсот шістдесят чотири |
| Vietnamese | hai mươi mốt nghìn sáu trăm sáu mươi tư |
| Number 21664 reversed | 46612 | |
| Unicode Character | U+54A0 | 咠 |
| Unix Timestamp | Thu, 01 Jan 1970 06:01:04 +0000 | |