Compare 221 vs 223
| Property | 221 | 223 |
|---|---|---|
| Type | semiprime | prime |
| Unique factors | 2 | 1 |
| Total factors | 2 | 1 |
| Prime factorization | 131 × 171 | 2231 |
| Prime factorization | 13 × 17 | 223 |
| Divisors count | 4 | 2 |
| Divisors | 1, 13, 17, 221 | 1, 223 |
| Number of properties | 1 | 13 |
| Additive primes | 28th | |
| Carol primes | 3rd | |
| Cousin primes (1st member) | 15th | |
| Good primes | 17th | |
| Harmonic primes | 17th | |
| Isolated primes | 19th | |
| Left-truncatable primes | 21st | |
| Long primes | 18th | |
| Lucky primes | 15th | |
| Primes | 48th | |
| Prime triplets (1st member) | 15th | |
| Semiprimes | 75th | |
| Sexy primes (1st member) | 27th | |
| Solinas primes | 27th | |
| Roman numberals | CCXXI | CCXXIII |
| Base 2 | 110111012 | 110111112 |
| Base 3 | 220123 | 220213 |
| Base 4 | 31314 | 31334 |
| Base 5 | 13415 | 13435 |
| Base 6 | 10056 | 10116 |
| Base 7 | 4347 | 4367 |
| Base 8 | 3358 | 3378 |
| Base 9 | 2659 | 2679 |
| Base 10 | 22110 | 22310 |
| Base 11 | 19111 | 19311 |
| Base 12 | 16512 | 16712 |
| Base 13 | 14013 | 14213 |
| Base 14 | 11b14 | 11d14 |
| Base 15 | eb15 | ed15 |
| Base 16 | dd16 | df16 |