Names of 18821
| Nominal | 18821 |
| Cardinal | eighteen thousand eight hundred twenty-one |
| Ordinal | 18,821st |
| This number as US currency | eighteen thousand eight hundred twenty-one dollars |
| Is 18821 an odd number? | 18821 is an odd number |
| Is 18821 an even number? | 18821 is NOT an even number |
| Is 18821 a palindrome? | 18821 is NOT a palindrome number |
| Is 18821 a triangle number? | 18821 is NOT a triangle number |
18821 in other Bases
| Base 2 (Binary) | 1001001100001012 |
| Base 3 (Ternary) | 2212110023 |
| Base 4 (Quaternary) | 102120114 |
| Base 5 (Quinary) | 11002415 |
| Base 6 (Senary) | 2230456 |
| Base 8 (Octal) | 446058 |
| Base 12 (Duodecimal) | AA8512 |
| Base 16 (Hexadecimal) | 498516 |
| Base 20 (Vigesimal) | 271120 |
Primes and Factors tests for 18821
| Is 18821 a Prime Number? | 18821 is NOT a prime |
| Is 18821 a perfect number? | 18821 is NOT a perfect number |
| Is 18821 a Mersenne Prime? | 18821 is NOT a Mersenne prime |
| Is 18821 a Fermat Prime? | 18821 is NOT a Fermat prime |
| Is 18821 a Fibonacci Prime? | 18821 is NOT a Fibonacci prime |
| Is 18821 a Partition Prime? | 18821 is NOT a Partition prime |
| Is 18821 a Pell Prime? | 18821 is NOT a Pell prime |
| Prime Factors | Prime factors of 18821 |
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18821 in other Numerals
| 18821 in Roman Numeral | XVMMMDCCCXXI |
| 18821 in Chinese Numeral | 壹萬捌仟捌佰貳拾壹 |
| 18821 in Egyptian Numeral | 𓂭𓇃𓍩𓎇𓏺 |
| 18821 in Babylonian Numeral |    |
Roots and stuff for 18821
| Is 18821 a square number? | 18821 is NOT a square number |
| Is 18821 a cube number? | 18821 is NOT a cube number |
| Square root of the number 18821 | 137.18964975537 |
| Cube root of the number 18821 | 26.599954774077 |
Recreational math for 18821
| Number 18821 reversed | 12881 |
| Sum of the digits | 20 |
| No of digits | 5 |