Names of 21040
| Nominal | 21040 |
| Cardinal | twenty-one thousand forty |
| Ordinal | 21,040th |
| This number as US currency | twenty-one thousand forty dollars |
| Is 21040 an odd number? | 21040 is NOT an odd number |
| Is 21040 an even number? | 21040 is an even number |
| Is 21040 a palindrome? | 21040 is NOT a palindrome number |
| Is 21040 a triangle number? | 21040 is NOT a triangle number |
21040 in other Bases
| Base 2 (Binary) | 1010010001100002 |
| Base 3 (Ternary) | 10012120213 |
| Base 4 (Quaternary) | 110203004 |
| Base 5 (Quinary) | 11331305 |
| Base 6 (Senary) | 2412246 |
| Base 8 (Octal) | 510608 |
| Base 12 (Duodecimal) | 1021412 |
| Base 16 (Hexadecimal) | 523016 |
| Base 20 (Vigesimal) | 2CC020 |
Primes and Factors tests for 21040
| Is 21040 a Prime Number? | 21040 is NOT a prime |
| Is 21040 a perfect number? | 21040 is NOT a perfect number |
| Is 21040 a Mersenne Prime? | 21040 is NOT a Mersenne prime |
| Is 21040 a Fermat Prime? | 21040 is NOT a Fermat prime |
| Is 21040 a Fibonacci Prime? | 21040 is NOT a Fibonacci prime |
| Is 21040 a Partition Prime? | 21040 is NOT a Partition prime |
| Is 21040 a Pell Prime? | 21040 is NOT a Pell prime |
| Prime Factors | Prime factors of 21040 |
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21040 in other Numerals
| 21040 in Roman Numeral | XXMXL |
| 21040 in Chinese Numeral | 貳萬壹仟肆拾 |
| 21040 in Egyptian Numeral | 𓂮𓆼𓎉 |
| 21040 in Babylonian Numeral |    |
Roots and stuff for 21040
| Is 21040 a square number? | 21040 is NOT a square number |
| Is 21040 a cube number? | 21040 is NOT a cube number |
| Square root of the number 21040 | 145.05171491575 |
| Cube root of the number 21040 | 27.606747632572 |
Recreational math for 21040
| Number 21040 reversed | 04012 |
| Sum of the digits | 7 |
| No of digits | 5 |