| Nominal | 21240 |
| Cardinal | twenty-one thousand two hundred forty |
Cardinal twenty-one thousand two hundred forty | |
| Ordinal | 21,240th |
| Number of digits | 5 |
| Sum of digits | 9 |
| Product of digits | 0 |
| Number parity | Even |
| Prime factorization | 2 x 2 x 2 x 3 x 3 x 5 x 59 |
| Prime factorization in exponent form | 23 x 32 x 5 x 59 |
| Prime factors | 2, 3, 5, 59 |
| Number of distinct prime factors ω(n) | 4 |
| Total number of prime factors Ω(n) | 7 |
| Sum of prime factors | 69 |
| Product of prime factors | 1770 |
| Is 21240 a prime number? | No |
| Is 21240 a semiprime number? | No |
| Is 21240 a Chen prime number? | No |
| Is 21240 a Mersenne prime number? | No |
| Is 21240 a Catalan number? | No |
| Is 21240 a Fibonacci number? | No |
| Is 21240 a Idoneal number? | No |
| Square of 21240 (n2) | 451137600 |
| Cube of 21240 (n3) | 9582162624000 |
| Square root of 21240 | 145.73949361789 |
| Natural Logarithm (ln) of 21240 | 9.9636414753559 |
| Decimal Logarithm (log) of 21240 | 4.3271545124094 |
| Sine of 21240 | 0.30308753107903 |
| Cosecant of 21240 | 3.2993769042226 |
| Cosine of 21240 | -0.95296272146628 |
| Secant of 21240 | -1.0493589911485 |
| Tangent of 21240 | -0.31804762584279 |
| Cotangent of 21240 | -3.1441831937909 |
| The spelling of 21240 in words is "twenty-one thousand two hundred forty", meaning that: |
| 21240 is not an aban number (as it contains the letter a) |
| 21240 is not an eban number (as it contains the letter e) |
| 21240 is an iban number (a number without the letter i) |
| 21240 is not an oban number (as it contains the letter o) |
| 21240 is not a tban number (as it contains the letter t) |
| 21240 is not an uban number (as it contains the letter u) |
| Bengali numerals | ২১২৪০ |
| Eastern Arabic numerals | ٢١٬٢٤٠ |
| Hieroglyphs numeralsused in Ancient Egypt | 𓂭𓂭𓆼𓍣𓎉 |
| Khmer numerals | ២១២៤០ |
| Japanese numerals | 二万千二百四十 |
| Roman numerals | n/a |
| Thai numerals | ๒๑๒๔๐ |
| Arabic | واحد و عشرون ألف و مائتان و أربعون |
| Croatian | dvadeset i jedna tisuća dvjesto četrdeset |
| Czech | dvacet jedna tisíc dvě stě čtyřicet |
| Danish | en og tyve tusinde to hundrede fyrre |
| Dutch | éénentwintigduizend tweehonderdveertig |
| Estonian | akpe blaeve vɔ ɖekɛ alafa eve kple blaene |
| Faroese | tjúgoeitt tusin og tveyhundraðogfýrati |
| Filipino | dalawáng pû’t isáng libó’t dalawáng daán at ápat na pû |
| Finnish | kaksikymmentäyksituhattakaksisataaneljäkymmentä |
| French | vingt et un mille deux cent quarante |
| Greek | είκοσι μία χίλιάδες διακόσια σαράντα |
| German | einundzwanzigtausendzweihundertvierzig |
| Hebrew | עשרים ואחד אלף מאתיים ארבעים |
| Hindi | इक्कीस हज़ार दो सौ चालीस |
| Hungarian | huszonegyezerkétszáznegyven |
| Icelandic | tuttugu og eitt þúsund og tvöhundrað og fjörutíu |
| Indonesian | dua puluh satu ribu dua ratus empat puluh |
| Italian | ventunomiladuecentoquaranta |
| Japanese | 二万千二百四十 |
| Korean | 이만 천이백사십 |
| Latvian | divdesmit viens tūkstoši divsimt četrdesmit |
| Lithuanian | dvidešimt vienas tūkstantis du šimtai keturiasdešimt |
| Norwegian | tjueett tusen to hundre og førti |
| Persian | بیست و یک هزار و دویست و چهل |
| Polish | dwadzieścia jeden tysięcy dwieście czterdzieści |
| Portuguese | vinte e um mil duzentos e quarenta |
| Romanian | douăzeci şi una mii două sute patruzeci |
| Russian | двадцать одна тысяча двести сорок |
| Serbian | двадесет и једна хиљада двеста четрдесет |
| Slovak | dvadsaťjedna tisíc dvesto štyridsať |
| Slovene | dvaset ena tisuću dvjesto štirideset |
| Spanish | veintiún mil doscientos cuarenta |
| Swahili | elfu ishirini na moja, mia mbili na arobaini |
| Swedish | tjugoentusentvåhundrafyrtio |
| Thai | สองหมื่นหนึ่งพันสองร้อยสี่สิบ |
| Turkish | yirmi bir bin iki yüz kırk |
| Ukrainian | двадцять одна тисяча двісті сорок |
| Vietnamese | hai mươi mốt nghìn hai trăm bốn mươi |
| Number 21240 reversed | 04212 | |
| Unicode Character | U+52F8 | 勸 |
| Unix Timestamp | Thu, 01 Jan 1970 05:54:00 +0000 | |