Names of 1221
| Nominal | 1221 |
| Cardinal | one thousand two hundred twenty-one |
| Ordinal | 1,221st |
| This number as US currency | one thousand two hundred twenty-one dollars |
| Is 1221 an odd number? | 1221 is an odd number |
| Is 1221 an even number? | 1221 is NOT an even number |
| Is 1221 a palindrome? | 1221 is a palindrome number |
| Is 1221 a triangle number? | 1221 is NOT a triangle number |
1221 in other Bases
| Base 2 (Binary) | 100110001012 |
| Base 3 (Ternary) | 12000203 |
| Base 4 (Quaternary) | 1030114 |
| Base 5 (Quinary) | 143415 |
| Base 6 (Senary) | 53536 |
| Base 8 (Octal) | 23058 |
| Base 12 (Duodecimal) | 85912 |
| Base 16 (Hexadecimal) | 4C516 |
| Base 20 (Vigesimal) | 31120 |
Primes and Factors tests for 1221
| Is 1221 a Prime Number? | 1221 is NOT a prime |
| Is 1221 a perfect number? | 1221 is NOT a perfect number |
| Is 1221 a Mersenne Prime? | 1221 is NOT a Mersenne prime |
| Is 1221 a Fermat Prime? | 1221 is NOT a Fermat prime |
| Is 1221 a Fibonacci Prime? | 1221 is NOT a Fibonacci prime |
| Is 1221 a Partition Prime? | 1221 is NOT a Partition prime |
| Is 1221 a Pell Prime? | 1221 is NOT a Pell prime |
| Prime Factors | Prime factors of 1221 |
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1221 in other Numerals
| 1221 in Roman Numeral | MCCXXI |
| 1221 in Chinese Numeral | 壹仟貳佰貳拾壹 |
| 1221 in Egyptian Numeral | 𓆼𓍣𓎇𓏺 |
| 1221 in Babylonian Numeral |   |
Roots and stuff for 1221
| Is 1221 a square number? | 1221 is NOT a square number |
| Is 1221 a cube number? | 1221 is NOT a cube number |
| Square root of the number 1221 | 34.942810419312 |
| Cube root of the number 1221 | 10.688215984317 |
Recreational math for 1221
| Number 1221 reversed | 1221 |
| Sum of the digits | 6 |
| No of digits | 4 |