1. Numbers
  2. Compare 21 vs 23

Compare 21 vs 23

Property2123
Typesemiprimeprime
Unique factors21
Total factors21
Prime factorization31 × 71231
Prime factorization3 × 723
Divisors count42
Divisors1, 3, 7, 211, 23
Number of properties130
Additive primes 6th
Chen primes 9th
Class 1+ primes 7th
Cousin primes (2nd member) 4th
Factorial primes 5th
Happy primes 4th
Harmonic primes 4th
Isolated primes 2nd
Kynea primes 3rd
Left-truncatable primes 7th
Long primes 4th
Pierpont primes of the 2nd kind 7th
Primes 9th
Prime quintuplet 2s (5th member) 2nd
Prime sextuplets (6th member) 1st
Prime triplets (3rd member) 5th
Right-truncatable primes 5th
Safe primes 4th
Semiprimes7th 
Sexy primes (1st member) 6th
Sexy primes (2nd member) 5th
Sexy prime quadrupletss (3rd member) 2nd
Sexy prime quadrupletss (4th member) 1st
Sexy prime triplets (2nd member) 4th
Sexy prime triplets (3rd member) 3rd
Solinas primes 8th
Sophie germain primes 5th
Thabit primes 4th
Two-sided primes 5th
Wedderburn-etherington primes 4th
Woodall primes 2nd
Roman numberalsXXIXXIII
Base 2101012101112
Base 321032123
Base 411141134
Base 5415435
Base 6336356
Base 7307327
Base 8258278
Base 9239259
Base 1021102310
Base 111a112111
Base 1219121b12
Base 1318131a13
Base 1417141914
Base 1516151815
Base 1615161716
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