Compare 21 vs 29
Property | 21 | 29 |
---|---|---|
Type | semiprime | prime |
Unique factors | 2 | 1 |
Total factors | 2 | 1 |
Prime factorization | 31 × 71 | 291 |
Prime factorization | 3 × 7 | 29 |
Divisors count | 4 | 2 |
Divisors | 1, 3, 7, 21 | 1, 29 |
Number of properties | 1 | 14 |
Additive primes | 7th | |
Chen primes | 10th | |
Good primes | 4th | |
Long primes | 5th | |
Lucas primes | 5th | |
Primes | 10th | |
Pythagorean primes | 4th | |
Right-truncatable primes | 6th | |
Semiprimes | 7th | |
Sexy primes (2nd member) | 6th | |
Sexy prime quadrupletss (4th member) | 2nd | |
Sexy prime triplets (3rd member) | 4th | |
Solinas primes | 9th | |
Sophie germain primes | 6th | |
Twin primes (1st member) | 5th | |
Roman numberals | XXI | XXIX |
Base 2 | 101012 | 111012 |
Base 3 | 2103 | 10023 |
Base 4 | 1114 | 1314 |
Base 5 | 415 | 1045 |
Base 6 | 336 | 456 |
Base 7 | 307 | 417 |
Base 8 | 258 | 358 |
Base 9 | 239 | 329 |
Base 10 | 2110 | 2910 |
Base 11 | 1a11 | 2711 |
Base 12 | 1912 | 2512 |
Base 13 | 1813 | 2313 |
Base 14 | 1714 | 2114 |
Base 15 | 1615 | 1e15 |
Base 16 | 1516 | 1d16 |