| Nominal | 18521 |
| Cardinal | eighteen thousand five hundred twenty-one |
Cardinal eighteen thousand five hundred twenty-one | |
| Ordinal | 18,521st |
| Number of digits | 5 |
| Sum of digits | 17 |
| Product of digits | 80 |
| Number parity | Odd |
| Prime factorization | 18521 |
| Prime factors | 18521 |
| Number of distinct prime factors ω(n) | 1 |
| Total number of prime factors Ω(n) | 1 |
| Sum of prime factors | 18521 |
| Product of prime factors | 18521 |
| Is 18521 a prime number? | Yes |
| Is 18521 a semiprime number? | No |
| Is 18521 a Chen prime number? | Yes |
| Is 18521 a Mersenne prime number? | No |
| Is 18521 a Catalan number? | No |
| Is 18521 a Fibonacci number? | No |
| Is 18521 a Idoneal number? | No |
| Square of 18521 (n2) | 343027441 |
| Cube of 18521 (n3) | 6353211234761 |
| Square root of 18521 | 136.09188072769 |
| Natural Logarithm (ln) of 18521 | 9.8266605024228 |
| Decimal Logarithm (log) of 18521 | 4.2676644317389 |
| Sine of 18521 | -0.96652115889016 |
| Cosecant of 18521 | -1.0346384978765 |
| Cosine of 18521 | -0.25658692370738 |
| Secant of 18521 | -3.8973147405612 |
| Tangent of 18521 | 3.7668371596069 |
| Cotangent of 18521 | 0.26547470931936 |
| The spelling of 18521 in words is "eighteen thousand five hundred twenty-one", meaning that: |
| 18521 is not an aban number (as it contains the letter a) |
| 18521 is not an eban number (as it contains the letter e) |
| 18521 is not an iban number (as it contains the letter i) |
| 18521 is not an oban number (as it contains the letter o) |
| 18521 is not a tban number (as it contains the letter t) |
| 18521 is not an uban number (as it contains the letter u) |
| Bengali numerals | ১৮৫২১ |
| Eastern Arabic numerals | ١٨٬٥٢١ |
| Hieroglyphs numeralsused in Ancient Egypt | 𓂭𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓍦𓎇𓏺 |
| Khmer numerals | ១៨៥២១ |
| Japanese numerals | 一万八千五百二十一 |
| Roman numerals | n/a |
| Thai numerals | ๑๘๕๒๑ |
| Arabic | ثمانية عشر ألف و خمسة مائة و واحد و عشرون |
| Croatian | osamnaest tisuća petsto dvadeset i jedan |
| Czech | osmnáct tisíc pět set dvacet jeden |
| Danish | atten tusinde fem hundrede en og tyve |
| Dutch | achttienduizend vijfhonderdéénentwintig |
| Estonian | akpe wuienyi alafa atɔ̃ blaeve vɔ ɖekɛ |
| Faroese | átjan tusin og fimmhundraðogtjúgoein |
| Filipino | labíng-walóng libó’t limáng daán at dalawáng pû’t isá |
| Finnish | kahdeksantoistatuhattaviisisataakaksikymmentäyksi |
| French | dix-huit mille cinq cent vingt et un |
| Greek | δεκαοκτώ χίλιάδες πεντακόσια είκοσι ένα |
| German | achtzehntausendfünfhunderteinundzwanzig |
| Hebrew | שמונה עשר אלף חמש מאות עשרים ואחת |
| Hindi | अठारह हज़ार पाँच सौ इक्कीस |
| Hungarian | tizennyolcezerötszázhuszonegy |
| Icelandic | átján þúsund og fimmhundrað og tuttugu og einn |
| Indonesian | delapan belas ribu lima ratus dua puluh satu |
| Italian | diciottomilacinquecentoventuno |
| Japanese | 一万八千五百二十一 |
| Korean | 만 팔천오백이십일 |
| Latvian | astoņpadsmit tūkstoši piecsimt divdesmit viens |
| Lithuanian | aštuoniolika tūkstančių penki šimtai dvidešimt vienas |
| Norwegian | atten tusen fem hundre og tjueén |
| Persian | هجده هزار و پانصد و بیست و یک |
| Polish | osiemnaście tysięcy pięćset dwadzieścia jeden |
| Portuguese | dezoito mil quinhentos e vinte e um |
| Romanian | optsprezece mii cinci sute douăzeci şi unu |
| Russian | восемнадцать тысяч пятьсот двадцать один |
| Serbian | осамнаест хиљада петсто двадесет и један |
| Slovak | osemnásť tisíc päťsto dvadsaťjeden |
| Slovene | asemnajst tisuću petsto dvaset ena |
| Spanish | dieciocho mil quinientos veintiuno |
| Swahili | elfu kumi na nane, mia tano na ishirini na moja |
| Swedish | artontusenfemhundratjugoen |
| Thai | หนึ่งหมื่นแปดพันห้าร้อยยี่สิบเอ็ด |
| Turkish | on sekiz bin beş yüz yirmi bir |
| Ukrainian | вісімнадцять тисяч пʼятсот двадцять один |
| Vietnamese | mười tám nghìn năm trăm hai mươi mốt |
| Number 18521 reversed | 12581 | |
| Unicode Character | U+4859 | 䡙 |
| Unix Timestamp | Thu, 01 Jan 1970 05:08:41 +0000 | |