| Nominal | 81121 |
| Cardinal | eighty-one thousand one hundred twenty-one |
Cardinal eighty-one thousand one hundred twenty-one | |
| Ordinal | 81,121st |
| Number of digits | 5 |
| Sum of digits | 13 |
| Product of digits | 16 |
| Number parity | Odd |
| Prime factorization | 23 x 3527 |
| Prime factors | 23, 3527 |
| Number of distinct prime factors ω(n) | 2 |
| Total number of prime factors Ω(n) | 2 |
| Sum of prime factors | 3550 |
| Product of prime factors | 81121 |
| Is 81121 a prime number? | No |
| Is 81121 a semiprime number? | Yes |
| Is 81121 a Chen prime number? | No |
| Is 81121 a Mersenne prime number? | No |
| Is 81121 a Catalan number? | No |
| Is 81121 a Fibonacci number? | No |
| Is 81121 a Idoneal number? | No |
| Square of 81121 (n2) | 6580616641 |
| Cube of 81121 (n3) | 533826202534561 |
| Square root of 81121 | 284.81748541829 |
| Natural Logarithm (ln) of 81121 | 11.303697146165 |
| Decimal Logarithm (log) of 81121 | 4.9091332956851 |
| Sine of 81121 | -0.93401830218182 |
| Cosecant of 81121 | -1.070642831799 |
| Cosine of 81121 | 0.35722515475452 |
| Secant of 81121 | 2.799354935369 |
| Tangent of 81121 | -2.6146487439376 |
| Cotangent of 81121 | -0.3824605512762 |
| The spelling of 81121 in words is "eighty-one thousand one hundred twenty-one", meaning that: |
| 81121 is not an aban number (as it contains the letter a) |
| 81121 is not an eban number (as it contains the letter e) |
| 81121 is not an iban number (as it contains the letter i) |
| 81121 is not an oban number (as it contains the letter o) |
| 81121 is not a tban number (as it contains the letter t) |
| 81121 is not an uban number (as it contains the letter u) |
| Bengali numerals | ৮১১২১ |
| Eastern Arabic numerals | ٨١٬١٢١ |
| Hieroglyphs numeralsused in Ancient Egypt | 𓂭𓂭𓂭𓂭𓂭𓂭𓂭𓂭𓆼𓍢𓎇𓏺 |
| Khmer numerals | ៨១១២១ |
| Japanese numerals | 八万千百二十一 |
| Roman numerals | n/a |
| Thai numerals | ๘๑๑๒๑ |
| Arabic | واحد و ثمانون ألف و مائة و واحد و عشرون |
| Croatian | osamdeset i jedna tisuća sto dvadeset i jedan |
| Czech | osmdesát jedna tisíc sto dvacet jeden |
| Danish | en og firs tusinde et hundrede en og tyve |
| Dutch | éénentachtigduizend honderdéénentwintig |
| Estonian | akpe blaenyi vɔ ɖekɛ alafa ɖeka blaeve vɔ ɖekɛ |
| Faroese | áttatieitt tusin og eitthundraðogtjúgoein |
| Filipino | walóng pû’t isáng libó’t isáng daán at dalawáng pû’t isá |
| Finnish | kahdeksankymmentäyksituhattasatakaksikymmentäyksi |
| French | quatre-vingt-un mille cent vingt et un |
| Greek | ογδόντα μία χίλιάδες εκατόν είκοσι ένα |
| German | einundachtzigtausendeinhunderteinundzwanzig |
| Hebrew | שמונים ואחד אלף מאה עשרים ואחת |
| Hindi | इक्यासी हज़ार एक सौ इक्कीस |
| Hungarian | nyolcvanegyezerszázhuszonegy |
| Icelandic | áttatíu og eitt þúsund og eitthundrað og tuttugu og einn |
| Indonesian | delapan puluh satu ribu seratus dua puluh satu |
| Italian | ottant e unmilacentoventuno |
| Japanese | 八万千百二十一 |
| Korean | 팔만 천백이십일 |
| Latvian | astoņdesmit viens tūkstoši simt divdesmit viens |
| Lithuanian | aštuoniasdešimt vienas tūkstantis šimtas dvidešimt vienas |
| Norwegian | åttiett tusen hundre og tjueén |
| Persian | هشتاد و یک هزار و صد و بیست و یک |
| Polish | osiemdziesiąt jeden tysięcy sto dwadzieścia jeden |
| Portuguese | oitenta e um mil cento e vinte e um |
| Romanian | optzeci şi una mii una sută douăzeci şi unu |
| Russian | восемьдесят одна тысяча сто двадцать один |
| Serbian | осамдесет и једна хиљада сто двадесет и један |
| Slovak | osemdesiatjedna tisíc jednasto dvadsaťjeden |
| Slovene | osemdeset ena tisuću sto dvaset ena |
| Spanish | ochenta y un mil ciento veintiuno |
| Swahili | elfu themanini na moja, mia moja na ishirini na moja |
| Swedish | åttioentusenenhundratjugoen |
| Thai | แปดหมื่นหนึ่งพันหนึ่งร้อยยี่สิบเอ็ด |
| Turkish | seksen bir bin yüz yirmi bir |
| Ukrainian | вісімдесят одна тисяча сто двадцять один |
| Vietnamese | tám mươi mốt nghìn một trăm hai mươi mốt |
| Number 81121 reversed | 12118 | |
| Unicode Character | U+13CE1 | |
| Unix Timestamp | Thu, 01 Jan 1970 22:32:01 +0000 | |