| Nominal | 21390 |
| Cardinal | twenty-one thousand three hundred ninety |
Cardinal twenty-one thousand three hundred ninety | |
| Ordinal | 21,390th |
| Number of digits | 5 |
| Sum of digits | 15 |
| Product of digits | 0 |
| Number parity | Even |
| Prime factorization | 2 x 3 x 5 x 23 x 31 |
| Prime factors | 2, 3, 5, 23, 31 |
| Number of distinct prime factors ω(n) | 5 |
| Total number of prime factors Ω(n) | 5 |
| Sum of prime factors | 64 |
| Product of prime factors | 21390 |
| Is 21390 a prime number? | No |
| Is 21390 a semiprime number? | No |
| Is 21390 a Chen prime number? | No |
| Is 21390 a Mersenne prime number? | No |
| Is 21390 a Catalan number? | No |
| Is 21390 a Fibonacci number? | No |
| Is 21390 a Idoneal number? | No |
| Square of 21390 (n2) | 457532100 |
| Cube of 21390 (n3) | 9786611619000 |
| Square root of 21390 | 146.25320509309 |
| Natural Logarithm (ln) of 21390 | 9.9706788020765 |
| Decimal Logarithm (log) of 21390 | 4.3302107845715 |
| Sine of 21390 | 0.89318478843206 |
| Cosecant of 21390 | 1.1195891521568 |
| Cosine of 21390 | -0.44968981944623 |
| Secant of 21390 | -2.2237550345957 |
| Tangent of 21390 | -1.9862241701001 |
| Cotangent of 21390 | -0.50346784368735 |
| The spelling of 21390 in words is "twenty-one thousand three hundred ninety", meaning that: |
| 21390 is not an aban number (as it contains the letter a) |
| 21390 is not an eban number (as it contains the letter e) |
| 21390 is not an iban number (as it contains the letter i) |
| 21390 is not an oban number (as it contains the letter o) |
| 21390 is not a tban number (as it contains the letter t) |
| 21390 is not an uban number (as it contains the letter u) |
| Bengali numerals | ২১৩৯০ |
| Eastern Arabic numerals | ٢١٬٣٩٠ |
| Hieroglyphs numeralsused in Ancient Egypt | 𓂭𓂭𓆼𓍤𓎎 |
| Khmer numerals | ២១៣៩០ |
| Japanese numerals | 二万千三百九十 |
| Roman numerals | n/a |
| Thai numerals | ๒๑๓๙๐ |
| Arabic | واحد و عشرون ألف و ثلاثة مائة و تسعون |
| Croatian | dvadeset i jedna tisuća tristo devedeset |
| Czech | dvacet jedna tisíc tři sta devadesát |
| Danish | en og tyve tusinde tre hundrede halvfems |
| Dutch | éénentwintigduizend driehonderdnegentig |
| Estonian | akpe blaeve vɔ ɖekɛ alafa etɔ̃ kple blaasieke |
| Faroese | tjúgoeitt tusin og trýhundraðogníti |
| Filipino | dalawáng pû’t isáng libó’t tatlóng daán at siyám na pû |
| Finnish | kaksikymmentäyksituhattakolmesataayhdeksänkymmentä |
| French | vingt et un mille trois cent quatre-vingt-dix |
| Greek | είκοσι μία χίλιάδες τριακόσια εννενήντα |
| German | einundzwanzigtausenddreihundertneunzig |
| Hebrew | עשרים ואחד אלף שלוש מאות תשעים |
| Hindi | इक्कीस हज़ार तीन सौ नब्बे |
| Hungarian | huszonegyezerháromszázkilencven |
| Icelandic | tuttugu og eitt þúsund og þrjúhundrað og níutíu |
| Indonesian | dua puluh satu ribu tiga ratus sembilan puluh |
| Italian | ventunomilatrecentonovanta |
| Japanese | 二万千三百九十 |
| Korean | 이만 천삼백구십 |
| Latvian | divdesmit viens tūkstoši trīssimt deviņdesmit |
| Lithuanian | dvidešimt vienas tūkstantis trys šimtai devyniasdešimt |
| Norwegian | tjueett tusen tre hundre og nitti |
| Persian | بیست و یک هزار و سیصد و نود |
| Polish | dwadzieścia jeden tysięcy trzysta dziewięćdziesiąt |
| Portuguese | vinte e um mil trezentos e noventa |
| Romanian | douăzeci şi una mii trei sute nouăzeci |
| Russian | двадцать одна тысяча триста девяносто |
| Serbian | двадесет и једна хиљада триста деведесет |
| Slovak | dvadsaťjedna tisíc tristo deväťdesiat |
| Slovene | dvaset ena tisuću tristo devetdeset |
| Spanish | veintiún mil trescientos noventa |
| Swahili | elfu ishirini na moja, mia tatu na tisini |
| Swedish | tjugoentusentrehundranittio |
| Thai | สองหมื่นหนึ่งพันสามร้อยเก้าสิบ |
| Turkish | yirmi bir bin üç yüz doksan |
| Ukrainian | двадцять одна тисяча триста девʼяносто |
| Vietnamese | hai mươi mốt nghìn ba trăm chín mươi |
| Number 21390 reversed | 09312 | |
| Unicode Character | U+538E | 厎 |
| Unix Timestamp | Thu, 01 Jan 1970 05:56:30 +0000 | |