Compare 816 vs 821
| Property | 816 | 821 |
|---|---|---|
| Type | composite number | prime |
| Unique factors | 3 | 1 |
| Total factors | 6 | 1 |
| Prime factorization | 24 × 31 × 171 | 8211 |
| Prime factorization | 2 × 2 × 2 × 2 × 3 × 17 | 821 |
| Divisors count | 20 | 2 |
| Divisors | 1, 2, 3, 4, 6, 8, 12, 16, 17, 24, 34, 48, 51, 68, 102, 136, 204, 272, 408, 816 | 1, 821 |
| Number of properties | 0 | 10 |
| Additive primes | 75th | |
| Chen primes | 97th | |
| Good primes | 40th | |
| Long primes | 50th | |
| Primes | 142nd | |
| Prime quadruplets (1st member) | 5th | |
| Prime triplets (1st member) | 25th | |
| Pythagorean primes | 69th | |
| Sexy primes (1st member) | 64th | |
| Twin primes (1st member) | 32nd | |
| Roman numberals | DCCCXVI | DCCCXXI |
| Base 2 | 11001100002 | 11001101012 |
| Base 3 | 10100203 | 10101023 |
| Base 4 | 303004 | 303114 |
| Base 5 | 112315 | 112415 |
| Base 6 | 34406 | 34456 |
| Base 7 | 22447 | 22527 |
| Base 8 | 14608 | 14658 |
| Base 9 | 11069 | 11129 |
| Base 10 | 81610 | 82110 |
| Base 11 | 68211 | 68711 |
| Base 12 | 58012 | 58512 |
| Base 13 | 4aa13 | 4b213 |
| Base 14 | 42414 | 42914 |
| Base 15 | 39615 | 39b15 |
| Base 16 | 33016 | 33516 |