Names of 8421
| Nominal | 8421 |
| Cardinal | eight thousand four hundred twenty-one |
| Ordinal | 8,421st |
| This number as US currency | eight thousand four hundred twenty-one dollars |
| Is 8421 an odd number? | 8421 is an odd number |
| Is 8421 an even number? | 8421 is NOT an even number |
| Is 8421 a palindrome? | 8421 is NOT a palindrome number |
| Is 8421 a triangle number? | 8421 is NOT a triangle number |
8421 in other Bases
| Base 2 (Binary) | 100000111001012 |
| Base 3 (Ternary) | 1021122203 |
| Base 4 (Quaternary) | 20032114 |
| Base 5 (Quinary) | 2321415 |
| Base 6 (Senary) | 1025536 |
| Base 8 (Octal) | 203458 |
| Base 12 (Duodecimal) | 4A5912 |
| Base 16 (Hexadecimal) | 20E516 |
| Base 20 (Vigesimal) | 111120 |
Primes and Factors tests for 8421
| Is 8421 a Prime Number? | 8421 is NOT a prime |
| Is 8421 a perfect number? | 8421 is NOT a perfect number |
| Is 8421 a Mersenne Prime? | 8421 is NOT a Mersenne prime |
| Is 8421 a Fermat Prime? | 8421 is NOT a Fermat prime |
| Is 8421 a Fibonacci Prime? | 8421 is NOT a Fibonacci prime |
| Is 8421 a Partition Prime? | 8421 is NOT a Partition prime |
| Is 8421 a Pell Prime? | 8421 is NOT a Pell prime |
| Prime Factors | Prime factors of 8421 |
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8421 in other Numerals
| 8421 in Roman Numeral | VMMMCDXXI |
| 8421 in Chinese Numeral | 捌仟肆佰貳拾壹 |
| 8421 in Egyptian Numeral | 𓇃𓍥𓎇𓏺 |
| 8421 in Babylonian Numeral |    |
Roots and stuff for 8421
| Is 8421 a square number? | 8421 is NOT a square number |
| Is 8421 a cube number? | 8421 is NOT a cube number |
| Square root of the number 8421 | 91.766006778109 |
| Cube root of the number 8421 | 20.344852978535 |
Recreational math for 8421
| Number 8421 reversed | 1248 |
| Sum of the digits | 15 |
| No of digits | 4 |