| Nominal | 21540 |
| Cardinal | twenty-one thousand five hundred forty |
Cardinal twenty-one thousand five hundred forty | |
| Ordinal | 21,540th |
| Number of digits | 5 |
| Sum of digits | 12 |
| Product of digits | 0 |
| Number parity | Even |
| Prime factorization | 2 x 2 x 3 x 5 x 359 |
| Prime factorization in exponent form | 22 x 3 x 5 x 359 |
| Prime factors | 2, 3, 5, 359 |
| Number of distinct prime factors ω(n) | 4 |
| Total number of prime factors Ω(n) | 5 |
| Sum of prime factors | 369 |
| Product of prime factors | 10770 |
| Is 21540 a prime number? | No |
| Is 21540 a semiprime number? | No |
| Is 21540 a Chen prime number? | No |
| Is 21540 a Mersenne prime number? | No |
| Is 21540 a Catalan number? | No |
| Is 21540 a Fibonacci number? | No |
| Is 21540 a Idoneal number? | No |
| Square of 21540 (n2) | 463971600 |
| Cube of 21540 (n3) | 9993948264000 |
| Square root of 21540 | 146.76511847166 |
| Natural Logarithm (ln) of 21540 | 9.9776669507104 |
| Decimal Logarithm (log) of 21540 | 4.333245698962 |
| Sine of 21540 | 0.94603283621164 |
| Cosecant of 21540 | 1.0570457617565 |
| Cosine of 21540 | 0.3240707836405 |
| Secant of 21540 | 3.0857456163321 |
| Tangent of 21540 | 2.9192166772463 |
| Cotangent of 21540 | 0.3425576483563 |
| The spelling of 21540 in words is "twenty-one thousand five hundred forty", meaning that: |
| 21540 is not an aban number (as it contains the letter a) |
| 21540 is not an eban number (as it contains the letter e) |
| 21540 is not an iban number (as it contains the letter i) |
| 21540 is not an oban number (as it contains the letter o) |
| 21540 is not a tban number (as it contains the letter t) |
| 21540 is not an uban number (as it contains the letter u) |
| Bengali numerals | ২১৫৪০ |
| Eastern Arabic numerals | ٢١٬٥٤٠ |
| Hieroglyphs numeralsused in Ancient Egypt | 𓂭𓂭𓆼𓍦𓎉 |
| Khmer numerals | ២១៥៤០ |
| Japanese numerals | 二万千五百四十 |
| Roman numerals | n/a |
| Thai numerals | ๒๑๕๔๐ |
| Arabic | واحد و عشرون ألف و خمسة مائة و أربعون |
| Croatian | dvadeset i jedna tisuća petsto četrdeset |
| Czech | dvacet jedna tisíc pět set čtyřicet |
| Danish | en og tyve tusinde fem hundrede fyrre |
| Dutch | éénentwintigduizend vijfhonderdveertig |
| Estonian | akpe blaeve vɔ ɖekɛ alafa atɔ̃ kple blaene |
| Faroese | tjúgoeitt tusin og fimmhundraðogfýrati |
| Filipino | dalawáng pû’t isáng libó’t limáng daán at ápat na pû |
| Finnish | kaksikymmentäyksituhattaviisisataaneljäkymmentä |
| French | vingt et un mille cinq cent quarante |
| Greek | είκοσι μία χίλιάδες πεντακόσια σαράντα |
| German | einundzwanzigtausendfünfhundertvierzig |
| Hebrew | עשרים ואחד אלף חמש מאות ארבעים |
| Hindi | इक्कीस हज़ार पाँच सौ चालीस |
| Hungarian | huszonegyezerötszáznegyven |
| Icelandic | tuttugu og eitt þúsund og fimmhundrað og fjörutíu |
| Indonesian | dua puluh satu ribu lima ratus empat puluh |
| Italian | ventunomilacinquecentoquaranta |
| Japanese | 二万千五百四十 |
| Korean | 이만 천오백사십 |
| Latvian | divdesmit viens tūkstoši piecsimt četrdesmit |
| Lithuanian | dvidešimt vienas tūkstantis penki šimtai keturiasdešimt |
| Norwegian | tjueett tusen fem hundre og førti |
| Persian | بیست و یک هزار و پانصد و چهل |
| Polish | dwadzieścia jeden tysięcy pięćset czterdzieści |
| Portuguese | vinte e um mil quinhentos e quarenta |
| Romanian | douăzeci şi una mii cinci sute patruzeci |
| Russian | двадцать одна тысяча пятьсот сорок |
| Serbian | двадесет и једна хиљада петсто четрдесет |
| Slovak | dvadsaťjedna tisíc päťsto štyridsať |
| Slovene | dvaset ena tisuću petsto štirideset |
| Spanish | veintiún mil quinientos cuarenta |
| Swahili | elfu ishirini na moja, mia tano na arobaini |
| Swedish | tjugoentusenfemhundrafyrtio |
| Thai | สองหมื่นหนึ่งพันห้าร้อยสี่สิบ |
| Turkish | yirmi bir bin beş yüz kırk |
| Ukrainian | двадцять одна тисяча пʼятсот сорок |
| Vietnamese | hai mươi mốt nghìn năm trăm bốn mươi |
| Number 21540 reversed | 04512 | |
| Unicode Character | U+5424 | 吤 |
| Unix Timestamp | Thu, 01 Jan 1970 05:59:00 +0000 | |