| Nominal | 11821 |
| Cardinal | eleven thousand eight hundred twenty-one |
Cardinal eleven thousand eight hundred twenty-one | |
| Ordinal | 11,821st |
| Number of digits | 5 |
| Sum of digits | 13 |
| Product of digits | 16 |
| Number parity | Odd |
| Prime factorization | 11821 |
| Prime factors | 11821 |
| Number of distinct prime factors ω(n) | 1 |
| Total number of prime factors Ω(n) | 1 |
| Sum of prime factors | 11821 |
| Product of prime factors | 11821 |
| Is 11821 a prime number? | Yes |
| Is 11821 a semiprime number? | No |
| Is 11821 a Chen prime number? | No |
| Is 11821 a Mersenne prime number? | No |
| Is 11821 a Catalan number? | No |
| Is 11821 a Fibonacci number? | No |
| Is 11821 a Idoneal number? | No |
| Square of 11821 (n2) | 139736041 |
| Cube of 11821 (n3) | 1651819740661 |
| Square root of 11821 | 108.72442227945 |
| Natural Logarithm (ln) of 11821 | 9.3776328897504 |
| Decimal Logarithm (log) of 11821 | 4.072654217333 |
| Sine of 11821 | 0.72645924854524 |
| Cosecant of 11821 | 1.3765397054309 |
| Cosine of 11821 | -0.68720954606516 |
| Secant of 11821 | -1.4551602283842 |
| Tangent of 11821 | -1.0571146060249 |
| Cotangent of 11821 | -0.94597122610983 |
| The spelling of 11821 in words is "eleven thousand eight hundred twenty-one", meaning that: |
| 11821 is not an aban number (as it contains the letter a) |
| 11821 is not an eban number (as it contains the letter e) |
| 11821 is not an iban number (as it contains the letter i) |
| 11821 is not an oban number (as it contains the letter o) |
| 11821 is not a tban number (as it contains the letter t) |
| 11821 is not an uban number (as it contains the letter u) |
| Bengali numerals | ১১৮২১ |
| Eastern Arabic numerals | ١١٬٨٢١ |
| Hieroglyphs numeralsused in Ancient Egypt | 𓂭𓆼𓍩𓎇𓏺 |
| Khmer numerals | ១១៨២១ |
| Japanese numerals | 一万千八百二十一 |
| Roman numerals | n/a |
| Thai numerals | ๑๑๘๒๑ |
| Arabic | إحدى عشر ألف و ثمانية مائة و واحد و عشرون |
| Croatian | jedanaest tisuća osamsto dvadeset i jedan |
| Czech | jedenáct tisíc osm set dvacet jeden |
| Danish | elleve tusinde otte hundrede en og tyve |
| Dutch | elfduizend achthonderdéénentwintig |
| Estonian | akpe wuiɖekɛ alafa enyi blaeve vɔ ɖekɛ |
| Faroese | ellivu tusin og áttahundraðogtjúgoein |
| Filipino | labíng-isáng libó’t walóng daán at dalawáng pû’t isá |
| Finnish | yksitoistatuhattakahdeksansataakaksikymmentäyksi |
| French | onze mille huit cent vingt et un |
| Greek | έντεκα χίλιάδες οκτακόσια είκοσι ένα |
| German | elftausendachthunderteinundzwanzig |
| Hebrew | אחד עשר אלף שמונה מאות עשרים ואחת |
| Hindi | ग्यारह हज़ार आठ सौ इक्कीस |
| Hungarian | tizenegyezernyolcszázhuszonegy |
| Icelandic | ellefu þúsund og áttahundrað og tuttugu og einn |
| Indonesian | sebelas ribu delapan ratus dua puluh satu |
| Italian | undicimilaottocentoventuno |
| Japanese | 一万千八百二十一 |
| Korean | 만 천팔백이십일 |
| Latvian | vienpadsmit tūkstoši astoņsimt divdesmit viens |
| Lithuanian | vienuolika tūkstančių aštuoni šimtai dvidešimt vienas |
| Norwegian | elleve tusen åtte hundre og tjueén |
| Persian | یازده هزار و هشتصد و بیست و یک |
| Polish | jedenaście tysięcy osiemset dwadzieścia jeden |
| Portuguese | onze mil oitocentos e vinte e um |
| Romanian | unsprezece mii opt sute douăzeci şi unu |
| Russian | одиннадцать тысяч восемьсот двадцать один |
| Serbian | једанаест хиљада осамсто двадесет и један |
| Slovak | jedenásť tisíc osemsto dvadsaťjeden |
| Slovene | enajst tisuću osemsto dvaset ena |
| Spanish | once mil ochocientos veintiuno |
| Swahili | elfu kumi na moja, mia nane na ishirini na moja |
| Swedish | elvatusenåttahundratjugoen |
| Thai | หนึ่งหมื่นหนึ่งพันแปดร้อยยี่สิบเอ็ด |
| Turkish | on bir bin sekiz yüz yirmi bir |
| Ukrainian | одинадцять тисяч вісімсот двадцять один |
| Vietnamese | mười một nghìn tám trăm hai mươi mốt |
| Number 11821 reversed | 12811 | |
| Unicode Character | U+2E2D | ⸭ |
| Unix Timestamp | Thu, 01 Jan 1970 03:17:01 +0000 | |