Names of 21801
| Nominal | 21801 |
| Cardinal | twenty-one thousand eight hundred one |
| Ordinal | 21,801st |
| This number as US currency | twenty-one thousand eight hundred one dollars |
| Is 21801 an odd number? | 21801 is an odd number |
| Is 21801 an even number? | 21801 is NOT an even number |
| Is 21801 a palindrome? | 21801 is NOT a palindrome number |
| Is 21801 a triangle number? | 21801 is NOT a triangle number |
21801 in other Bases
| Base 2 (Binary) | 1010101001010012 |
| Base 3 (Ternary) | 10022201103 |
| Base 4 (Quaternary) | 111102214 |
| Base 5 (Quinary) | 11442015 |
| Base 6 (Senary) | 2445336 |
| Base 8 (Octal) | 524518 |
| Base 12 (Duodecimal) | 1074912 |
| Base 16 (Hexadecimal) | 552916 |
| Base 20 (Vigesimal) | 2EA120 |
Primes and Factors tests for 21801
| Is 21801 a Prime Number? | 21801 is NOT a prime |
| Is 21801 a perfect number? | 21801 is NOT a perfect number |
| Is 21801 a Mersenne Prime? | 21801 is NOT a Mersenne prime |
| Is 21801 a Fermat Prime? | 21801 is NOT a Fermat prime |
| Is 21801 a Fibonacci Prime? | 21801 is NOT a Fibonacci prime |
| Is 21801 a Partition Prime? | 21801 is NOT a Partition prime |
| Is 21801 a Pell Prime? | 21801 is NOT a Pell prime |
| Prime Factors | Prime factors of 21801 |
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21801 in other Numerals
| 21801 in Roman Numeral | XXMDCCCI |
| 21801 in Chinese Numeral | 貳萬壹仟捌佰壹 |
| 21801 in Egyptian Numeral | 𓂮𓆼𓍩𓏺 |
| 21801 in Babylonian Numeral |    |
Roots and stuff for 21801
| Is 21801 a square number? | 21801 is NOT a square number |
| Is 21801 a cube number? | 21801 is NOT a cube number |
| Square root of the number 21801 | 147.65161699081 |
| Cube root of the number 21801 | 27.935651550049 |
Recreational math for 21801
| Number 21801 reversed | 10812 |
| Sum of the digits | 12 |
| No of digits | 5 |