1. Numbers
  2. Compare 21990 vs 21991

Compare 21990 vs 21991

Property2199021991
Typecomposite numberprime
Unique factors41
Total factors41
Prime factorization21 × 31 × 51 × 7331219911
Prime factorization2 × 3 × 5 × 73321991
Divisors count162
Divisors1, 2, 3, 5, 6, 10, 15, 30, 733, 1466, 2199, 3665, 4398, 7330, 10995, 219901, 21991
Number of properties05
Chen primes 1208th
Isolated primes 1720th
Primes 2463rd
Sexy primes (1st member) 742nd
Sexy prime triplets (1st member) 202nd
Roman numberals  
Base 210101011110011021010101111001112
Base 31010011110310100111113
Base 4111132124111132134
Base 51200430512004315
Base 624545062454516
Base 712105371210547
Base 8527468527478
Base 9331439331449
Base 1021990102199110
Base 1115581111558211
Base 1210886121088712
Base 13a01713a01813
Base 14802a14802b14
Base 1567b01567b115
Base 1655e61655e716
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