| Nominal | 18421 |
| Cardinal | eighteen thousand four hundred twenty-one |
Cardinal eighteen thousand four hundred twenty-one | |
| Ordinal | 18,421st |
| Number of digits | 5 |
| Sum of digits | 16 |
| Product of digits | 64 |
| Number parity | Odd |
| Prime factorization | 13 x 13 x 109 |
| Prime factorization in exponent form | 132 x 109 |
| Prime factors | 13, 109 |
| Number of distinct prime factors ω(n) | 2 |
| Total number of prime factors Ω(n) | 3 |
| Sum of prime factors | 122 |
| Product of prime factors | 1417 |
| Is 18421 a prime number? | No |
| Is 18421 a semiprime number? | No |
| Is 18421 a Chen prime number? | No |
| Is 18421 a Mersenne prime number? | No |
| Is 18421 a Catalan number? | No |
| Is 18421 a Fibonacci number? | No |
| Is 18421 a Idoneal number? | No |
| Square of 18421 (n2) | 339333241 |
| Cube of 18421 (n3) | 6250857632461 |
| Square root of 18421 | 135.72398461584 |
| Natural Logarithm (ln) of 18421 | 9.8212465971522 |
| Decimal Logarithm (log) of 18421 | 4.2653132025543 |
| Sine of 18421 | -0.96337623789982 |
| Cosecant of 18421 | -1.0380160529805 |
| Cosine of 18421 | 0.26815335957245 |
| Secant of 18421 | 3.7292092912593 |
| Tangent of 18421 | -3.5926316173545 |
| Cotangent of 18421 | -0.27834749189687 |
| The spelling of 18421 in words is "eighteen thousand four hundred twenty-one", meaning that: |
| 18421 is not an aban number (as it contains the letter a) |
| 18421 is not an eban number (as it contains the letter e) |
| 18421 is not an iban number (as it contains the letter i) |
| 18421 is not an oban number (as it contains the letter o) |
| 18421 is not a tban number (as it contains the letter t) |
| 18421 is not an uban number (as it contains the letter u) |
| Bengali numerals | ১৮৪২১ |
| Eastern Arabic numerals | ١٨٬٤٢١ |
| Hieroglyphs numeralsused in Ancient Egypt | 𓂭𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓍥𓎇𓏺 |
| Khmer numerals | ១៨៤២១ |
| Japanese numerals | 一万八千四百二十一 |
| Roman numerals | n/a |
| Thai numerals | ๑๘๔๒๑ |
| Arabic | ثمانية عشر ألف و أربعة مائة و واحد و عشرون |
| Croatian | osamnaest tisuća četiristo dvadeset i jedan |
| Czech | osmnáct tisíc čtyři sta dvacet jeden |
| Danish | atten tusinde fire hundrede en og tyve |
| Dutch | achttienduizend vierhonderdéénentwintig |
| Estonian | akpe wuienyi alafa ene blaeve vɔ ɖekɛ |
| Faroese | átjan tusin og fýrehundraðogtjúgoein |
| Filipino | labíng-walóng libó’t ápat na daán at dalawáng pû’t isá |
| Finnish | kahdeksantoistatuhattaneljäsataakaksikymmentäyksi |
| French | dix-huit mille quatre cent vingt et un |
| Greek | δεκαοκτώ χίλιάδες τετρακόσια είκοσι ένα |
| German | achtzehntausendvierhunderteinundzwanzig |
| Hebrew | שמונה עשר אלף ארבע מאות עשרים ואחת |
| Hindi | अठारह हज़ार चार सौ इक्कीस |
| Hungarian | tizennyolcezernégyszázhuszonegy |
| Icelandic | átján þúsund og fjögurhundrað og tuttugu og einn |
| Indonesian | delapan belas ribu empat ratus dua puluh satu |
| Italian | diciottomilaquattrocentoventuno |
| Japanese | 一万八千四百二十一 |
| Korean | 만 팔천사백이십일 |
| Latvian | astoņpadsmit tūkstoši četrsimt divdesmit viens |
| Lithuanian | aštuoniolika tūkstančių keturi šimtai dvidešimt vienas |
| Norwegian | atten tusen fire hundre og tjueén |
| Persian | هجده هزار و چهارصد و بیست و یک |
| Polish | osiemnaście tysięcy czterysta dwadzieścia jeden |
| Portuguese | dezoito mil quatrocentos e vinte e um |
| Romanian | optsprezece mii patru sute douăzeci şi unu |
| Russian | восемнадцать тысяч четыреста двадцать один |
| Serbian | осамнаест хиљада четиристо двадесет и један |
| Slovak | osemnásť tisíc štyristo dvadsaťjeden |
| Slovene | asemnajst tisuću štiristo dvaset ena |
| Spanish | dieciocho mil cuatrocientos veintiuno |
| Swahili | elfu kumi na nane, mia nne na ishirini na moja |
| Swedish | artontusenfyrahundratjugoen |
| Thai | หนึ่งหมื่นแปดพันสี่ร้อยยี่สิบเอ็ด |
| Turkish | on sekiz bin dört yüz yirmi bir |
| Ukrainian | вісімнадцять тисяч чотириста двадцять один |
| Vietnamese | mười tám nghìn bốn trăm hai mươi mốt |
| Number 18421 reversed | 12481 | |
| Unicode Character | U+47F5 | 䟵 |
| Unix Timestamp | Thu, 01 Jan 1970 05:07:01 +0000 | |