221
Everything about the number 221 — its names, how to write it in other bases and numeral systems, and what makes it interesting mathematically.
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Names of 221
| Nominal | 221 |
| Cardinal | two hundred twenty-one |
| Ordinal | 221st |
| This number as US currency | two hundred twenty-one dollars |
Properties (and some facts) of 221
| 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 |
| Is 221 a triangle number? | 221 is not a triangle number |
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221 in other bases
| Base 2 (Binary) | 11011101 |
| Base 3 (Ternary) | 22012 |
| Base 4 (Quaternary) | 3131 |
| Base 5 (Quinary) | 1341 |
| Base 6 (Senary) | 1005 |
| Base 8 (Octal) | 335 |
| Base 12 (Duodecimal) | 165 |
| Base 16 (Hexadecimal) | DD |
| Base 20 (Vigesimal) | B1 |
Primes and factors tests for 221
| Is 221 a prime number? | 221 is not a prime number |
| 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 |
221 in other numeral systems
| 221 in Roman numerals | CCXXI |
| 221 in Chinese numerals | 貳佰貳拾壹 |
| 221 in Babylonian numerals |   |
| 221 in Egyptian numerals | 𓍣𓎇𓏺 |
Roots and squares 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 221 | 14.866068747319 |
| Cube root of 221 | 6.0459435960125 |
Recreational math for 221
| Number 221 reversed | 122 |
| Sum of the digits | 5 |
| Number of digits | 3 |
Arithmetic tables for 221
Other pages about 221
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