Compare 19991 vs 21187
| Property | 19991 | 21187 |
|---|---|---|
| Type | prime | prime |
| Unique factors | 1 | 1 |
| Total factors | 1 | 1 |
| Prime factorization | 199911 | 211871 |
| Prime factorization | 19991 | 21187 |
| Divisors count | 2 | 2 |
| Divisors | 1, 19991 | 1, 21187 |
| Number of properties | 9 | 7 |
| Additive primes | 1049th | 1107th |
| Chen primes | 1111th | |
| Cousin primes (1st member) | 361st | |
| Harmonic primes | 820th | 874th |
| Isolated primes | 1663rd | |
| Palindromic primes | 46th | |
| Primes | 2260th | 2382nd |
| Prime triplets (1st member) | 168th | 178th |
| Sexy primes (1st member) | 693rd | 722nd |
| Sophie germain primes | 326th | |
| Twin primes (1st member) | 342nd | |
| Roman numberals | ||
| Base 2 | 1001110000101112 | 1010010110000112 |
| Base 3 | 10001021023 | 10020012013 |
| Base 4 | 103201134 | 110230034 |
| Base 5 | 11144315 | 11342225 |
| Base 6 | 2323156 | 2420316 |
| Base 7 | 1121667 | 1155257 |
| Base 8 | 470278 | 513038 |
| Base 9 | 303729 | 320519 |
| Base 10 | 1999110 | 2118710 |
| Base 11 | 1402411 | 14a1111 |
| Base 12 | b69b12 | 1031712 |
| Base 13 | 913a13 | 984a13 |
| Base 14 | 73dd14 | 7a1514 |
| Base 15 | 5dcb15 | 642715 |
| Base 16 | 4e1716 | 52c316 |