Names of 221
| Nominal | 221 |
| Cardinal | two hundred twenty-one |
| Ordinal | 221st |
| This number as US currency | two hundred twenty-one dollars |
| Is 221 an odd number? | 221 is an odd number |
| Is 221 an even number? | 221 is NOT an even number |
| Is 221 a palindrome? | 221 is NOT a palindrome number |
| Is 221 a triangle number? | 221 is NOT a triangle number |
221 in other Bases
| Base 2 (Binary) | 110111012 |
| Base 3 (Ternary) | 220123 |
| Base 4 (Quaternary) | 31314 |
| Base 5 (Quinary) | 13415 |
| Base 6 (Senary) | 10056 |
| Base 8 (Octal) | 3358 |
| Base 12 (Duodecimal) | 16512 |
| Base 16 (Hexadecimal) | DD16 |
| Base 20 (Vigesimal) | B120 |
Primes and Factors tests for 221
| Is 221 a Prime Number? | 221 is NOT a prime |
| Is 221 a perfect number? | 221 is NOT a perfect number |
| Is 221 a Mersenne Prime? | 221 is NOT a Mersenne prime |
| Is 221 a Fermat Prime? | 221 is NOT a Fermat prime |
| Is 221 a Fibonacci Prime? | 221 is NOT a Fibonacci prime |
| Is 221 a Partition Prime? | 221 is NOT a Partition prime |
| Is 221 a Pell Prime? | 221 is NOT a Pell prime |
| Prime Factors | Prime factors of 221 |
Sponsored
221 in other Numerals
| 221 in Roman Numeral | CCXXI |
| 221 in Chinese Numeral | 貳佰貳拾壹 |
| 221 in Egyptian Numeral | 𓍣𓎇𓏺 |
| 221 in Babylonian Numeral |   |
Roots and stuff for 221
| Is 221 a square number? | 221 is NOT a square number |
| Is 221 a cube number? | 221 is NOT a cube number |
| Square root of the number 221 | 14.866068747319 |
| Cube root of the number 221 | 6.0459435960125 |
Recreational math for 221
| Number 221 reversed | 122 |
| Sum of the digits | 5 |
| No of digits | 3 |