| Nominal | 21918 |
| Cardinal | twenty-one thousand nine hundred eighteen |
Cardinal twenty-one thousand nine hundred eighteen | |
| Ordinal | 21,918th |
| Number of digits | 5 |
| Sum of digits | 21 |
| Product of digits | 144 |
| Number parity | Even |
| Prime factorization | 2 x 3 x 13 x 281 |
| Prime factors | 2, 3, 13, 281 |
| Number of distinct prime factors ω(n) | 4 |
| Total number of prime factors Ω(n) | 4 |
| Sum of prime factors | 299 |
| Product of prime factors | 21918 |
| Is 21918 a prime number? | No |
| Is 21918 a semiprime number? | No |
| Is 21918 a Chen prime number? | No |
| Is 21918 a Mersenne prime number? | No |
| Is 21918 a Catalan number? | No |
| Is 21918 a Fibonacci number? | No |
| Is 21918 a Idoneal number? | No |
| Square of 21918 (n2) | 480398724 |
| Cube of 21918 (n3) | 10529379232632 |
| Square root of 21918 | 148.04728974216 |
| Natural Logarithm (ln) of 21918 | 9.9950634960233 |
| Decimal Logarithm (log) of 21918 | 4.3408009225956 |
| Sine of 21918 | 0.77829391567688 |
| Cosecant of 21918 | 1.2848616439848 |
| Cosine of 21918 | -0.62790013602511 |
| Secant of 21918 | -1.5926099432474 |
| Tangent of 21918 | -1.239518628876 |
| Cotangent of 21918 | -0.80676480103153 |
| The spelling of 21918 in words is "twenty-one thousand nine hundred eighteen", meaning that: |
| 21918 is not an aban number (as it contains the letter a) |
| 21918 is not an eban number (as it contains the letter e) |
| 21918 is not an iban number (as it contains the letter i) |
| 21918 is not an oban number (as it contains the letter o) |
| 21918 is not a tban number (as it contains the letter t) |
| 21918 is not an uban number (as it contains the letter u) |
| Bengali numerals | ২১৯১৮ |
| Eastern Arabic numerals | ٢١٬٩١٨ |
| Hieroglyphs numeralsused in Ancient Egypt | 𓂭𓂭𓆼𓍪𓎆𓐁 |
| Khmer numerals | ២១៩១៨ |
| Japanese numerals | 二万千九百十八 |
| Roman numerals | n/a |
| Thai numerals | ๒๑๙๑๘ |
| Arabic | واحد و عشرون ألف و تسعة مائة و ثمانية عشر |
| Croatian | dvadeset i jedna tisuća devetsto osamnaest |
| Czech | dvacet jedna tisíc devět set osmnáct |
| Danish | en og tyve tusinde ni hundrede atten |
| Dutch | éénentwintigduizend negenhonderdachttien |
| Estonian | akpe blaeve vɔ ɖekɛ alafa asieke kple wuienyi |
| Faroese | tjúgoeitt tusin og níggjuhundraðogátjan |
| Filipino | dalawáng pû’t isáng libó’t siyám na daán at labíng-waló |
| Finnish | kaksikymmentäyksituhattayhdeksänsataakahdeksantoista |
| French | vingt et un mille neuf cent dix-huit |
| Greek | είκοσι μία χίλιάδες εννιακόσια δεκαοκτώ |
| German | einundzwanzigtausendneunhundertachtzehn |
| Hebrew | עשרים ואחד אלף תשע מאות ושמונה עשרה |
| Hindi | इक्कीस हज़ार नौ सौ अठारह |
| Hungarian | huszonegyezerkilencszáztizennyolc |
| Icelandic | tuttugu og eitt þúsund og níuhundrað og átján |
| Indonesian | dua puluh satu ribu sembilan ratus delapan belas |
| Italian | ventunomilanovecentodiciotto |
| Japanese | 二万千九百十八 |
| Korean | 이만 천구백십팔 |
| Latvian | divdesmit viens tūkstoši deviņsimt astoņpadsmit |
| Lithuanian | dvidešimt vienas tūkstantis devyni šimtai aštuoniolika |
| Norwegian | tjueett tusen ni hundre og atten |
| Persian | بیست و یک هزار و نهصد و هجده |
| Polish | dwadzieścia jeden tysięcy dziewięćset osiemnaście |
| Portuguese | vinte e um mil novecentos e dezoito |
| Romanian | douăzeci şi una mii nouă sute optsprezece |
| Russian | двадцать одна тысяча девятьсот восемнадцать |
| Serbian | двадесет и једна хиљада деветсто осамнаест |
| Slovak | dvadsaťjedna tisíc deväťsto osemnásť |
| Slovene | dvaset ena tisuću devetsto asemnajst |
| Spanish | veintiún mil novecientos dieciocho |
| Swahili | elfu ishirini na moja, mia tisa na kumi na nane |
| Swedish | tjugoentusenniohundraarton |
| Thai | สองหมื่นหนึ่งพันเก้าร้อยสิบแปด |
| Turkish | yirmi bir bin dokuz yüz on sekiz |
| Ukrainian | двадцять одна тисяча девʼятсот вісімнадцять |
| Vietnamese | hai mươi mốt nghìn chín trăm mười tám |
| Number 21918 reversed | 81912 | |
| Unicode Character | U+559E | 喞 |
| Unix Timestamp | Thu, 01 Jan 1970 06:05:18 +0000 | |