Names of 21081
| Nominal | 21081 |
| Cardinal | twenty-one thousand eighty-one |
| Ordinal | 21,081st |
| This number as US currency | twenty-one thousand eighty-one dollars |
| Is 21081 an odd number? | 21081 is an odd number |
| Is 21081 an even number? | 21081 is NOT an even number |
| Is 21081 a palindrome? | 21081 is NOT a palindrome number |
| Is 21081 a triangle number? | 21081 is NOT a triangle number |
21081 in other Bases
| Base 2 (Binary) | 1010010010110012 |
| Base 3 (Ternary) | 10012202103 |
| Base 4 (Quaternary) | 110211214 |
| Base 5 (Quinary) | 11333115 |
| Base 6 (Senary) | 2413336 |
| Base 8 (Octal) | 511318 |
| Base 12 (Duodecimal) | 1024912 |
| Base 16 (Hexadecimal) | 525916 |
| Base 20 (Vigesimal) | 2CE120 |
Primes and Factors tests for 21081
| Is 21081 a Prime Number? | 21081 is NOT a prime |
| Is 21081 a perfect number? | 21081 is NOT a perfect number |
| Is 21081 a Mersenne Prime? | 21081 is NOT a Mersenne prime |
| Is 21081 a Fermat Prime? | 21081 is NOT a Fermat prime |
| Is 21081 a Fibonacci Prime? | 21081 is NOT a Fibonacci prime |
| Is 21081 a Partition Prime? | 21081 is NOT a Partition prime |
| Is 21081 a Pell Prime? | 21081 is NOT a Pell prime |
| Prime Factors | Prime factors of 21081 |
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21081 in other Numerals
| 21081 in Roman Numeral | XXMLXXXI |
| 21081 in Chinese Numeral | 貳萬壹仟捌拾壹 |
| 21081 in Egyptian Numeral | 𓂮𓆼𓎍𓏺 |
| 21081 in Babylonian Numeral |    |
Roots and stuff for 21081
| Is 21081 a square number? | 21081 is NOT a square number |
| Is 21081 a cube number? | 21081 is NOT a cube number |
| Square root of the number 21081 | 145.19297503667 |
| Cube root of the number 21081 | 27.624668136851 |
Recreational math for 21081
| Number 21081 reversed | 18012 |
| Sum of the digits | 12 |
| No of digits | 5 |