| Nominal | 18821 |
| Cardinal | eighteen thousand eight hundred twenty-one |
Cardinal eighteen thousand eight hundred twenty-one | |
| Ordinal | 18,821st |
| Number of digits | 5 |
| Sum of digits | 20 |
| Product of digits | 128 |
| Number parity | Odd |
| Prime factorization | 11 x 29 x 59 |
| Prime factors | 11, 29, 59 |
| Number of distinct prime factors ω(n) | 3 |
| Total number of prime factors Ω(n) | 3 |
| Sum of prime factors | 99 |
| Product of prime factors | 18821 |
| Is 18821 a prime number? | No |
| Is 18821 a semiprime number? | No |
| Is 18821 a Chen prime number? | No |
| Is 18821 a Mersenne prime number? | No |
| Is 18821 a Catalan number? | No |
| Is 18821 a Fibonacci number? | No |
| Is 18821 a Idoneal number? | No |
| Square of 18821 (n2) | 354230041 |
| Cube of 18821 (n3) | 6666963601661 |
| Square root of 18821 | 137.18964975537 |
| Natural Logarithm (ln) of 18821 | 9.8427285466906 |
| Decimal Logarithm (log) of 18821 | 4.2746426946993 |
| Sine of 18821 | 0.27788112549151 |
| Cosecant of 18821 | 3.5986611117658 |
| Cosine of 18821 | -0.96061546942342 |
| Secant of 18821 | -1.0409992674803 |
| Tangent of 18821 | -0.28927404808326 |
| Cotangent of 18821 | -3.4569295331747 |
| The spelling of 18821 in words is "eighteen thousand eight hundred twenty-one", meaning that: |
| 18821 is not an aban number (as it contains the letter a) |
| 18821 is not an eban number (as it contains the letter e) |
| 18821 is not an iban number (as it contains the letter i) |
| 18821 is not an oban number (as it contains the letter o) |
| 18821 is not a tban number (as it contains the letter t) |
| 18821 is not an uban number (as it contains the letter u) |
| Bengali numerals | ১৮৮২১ |
| Eastern Arabic numerals | ١٨٬٨٢١ |
| Hieroglyphs numeralsused in Ancient Egypt | 𓂭𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓍩𓎇𓏺 |
| Khmer numerals | ១៨៨២១ |
| Japanese numerals | 一万八千八百二十一 |
| Roman numerals | n/a |
| Thai numerals | ๑๘๘๒๑ |
| Arabic | ثمانية عشر ألف و ثمانية مائة و واحد و عشرون |
| Croatian | osamnaest tisuća osamsto dvadeset i jedan |
| Czech | osmnáct tisíc osm set dvacet jeden |
| Danish | atten tusinde otte hundrede en og tyve |
| Dutch | achttienduizend achthonderdéénentwintig |
| Estonian | akpe wuienyi alafa enyi blaeve vɔ ɖekɛ |
| Faroese | átjan tusin og áttahundraðogtjúgoein |
| Filipino | labíng-walóng libó’t walóng daán at dalawáng pû’t isá |
| Finnish | kahdeksantoistatuhattakahdeksansataakaksikymmentäyksi |
| French | dix-huit mille huit cent vingt et un |
| Greek | δεκαοκτώ χίλιάδες οκτακόσια είκοσι ένα |
| German | achtzehntausendachthunderteinundzwanzig |
| Hebrew | שמונה עשר אלף שמונה מאות עשרים ואחת |
| Hindi | अठारह हज़ार आठ सौ इक्कीस |
| Hungarian | tizennyolcezernyolcszázhuszonegy |
| Icelandic | átján þúsund og áttahundrað og tuttugu og einn |
| Indonesian | delapan belas ribu delapan ratus dua puluh satu |
| Italian | diciottomilaottocentoventuno |
| Japanese | 一万八千八百二十一 |
| Korean | 만 팔천팔백이십일 |
| Latvian | astoņpadsmit tūkstoši astoņsimt divdesmit viens |
| Lithuanian | aštuoniolika tūkstančių aštuoni šimtai dvidešimt vienas |
| Norwegian | atten tusen åtte hundre og tjueén |
| Persian | هجده هزار و هشتصد و بیست و یک |
| Polish | osiemnaście tysięcy osiemset dwadzieścia jeden |
| Portuguese | dezoito mil oitocentos e vinte e um |
| Romanian | optsprezece mii opt sute douăzeci şi unu |
| Russian | восемнадцать тысяч восемьсот двадцать один |
| Serbian | осамнаест хиљада осамсто двадесет и један |
| Slovak | osemnásť tisíc osemsto dvadsaťjeden |
| Slovene | asemnajst tisuću osemsto dvaset ena |
| Spanish | dieciocho mil ochocientos veintiuno |
| Swahili | elfu kumi na nane, mia nane na ishirini na moja |
| Swedish | artontusenåttahundratjugoen |
| Thai | หนึ่งหมื่นแปดพันแปดร้อยยี่สิบเอ็ด |
| Turkish | on sekiz bin sekiz yüz yirmi bir |
| Ukrainian | вісімнадцять тисяч вісімсот двадцять один |
| Vietnamese | mười tám nghìn tám trăm hai mươi mốt |
| Number 18821 reversed | 12881 | |
| Unicode Character | U+4985 | 䦅 |
| Unix Timestamp | Thu, 01 Jan 1970 05:13:41 +0000 | |