Compare 1221 vs 1223
| Property | 1221 | 1223 |
|---|---|---|
| Type | composite number | prime |
| Unique factors | 3 | 1 |
| Total factors | 3 | 1 |
| Prime factorization | 31 × 111 × 371 | 12231 |
| Prime factorization | 3 × 11 × 37 | 1223 |
| Divisors count | 8 | 2 |
| Divisors | 1, 3, 11, 33, 37, 111, 407, 1221 | 1, 1223 |
| Number of properties | 0 | 10 |
| Emirps | 54th | |
| Harmonic primes | 70th | |
| Isolated primes | 119th | |
| Left-truncatable primes | 55th | |
| Long primes | 77th | |
| Primes | 200th | |
| Sexy primes (1st member) | 87th | |
| Sexy primes (2nd member) | 86th | |
| Sexy prime triplets (2nd member) | 33rd | |
| Sophie germain primes | 43rd | |
| Roman numberals | MCCXXI | MCCXXIII |
| Base 2 | 100110001012 | 100110001112 |
| Base 3 | 12000203 | 12000223 |
| Base 4 | 1030114 | 1030134 |
| Base 5 | 143415 | 143435 |
| Base 6 | 53536 | 53556 |
| Base 7 | 33637 | 33657 |
| Base 8 | 23058 | 23078 |
| Base 9 | 16069 | 16089 |
| Base 10 | 122110 | 122310 |
| Base 11 | a1011 | a1211 |
| Base 12 | 85912 | 85b12 |
| Base 13 | 72c13 | 73113 |
| Base 14 | 63314 | 63514 |
| Base 15 | 56615 | 56815 |
| Base 16 | 4c516 | 4c716 |