1. Numbers
  2. Compare 21980 vs 21991

Compare 21980 vs 21991

Property2198021991
Typecomposite numberprime
Unique factors41
Total factors51
Prime factorization22 × 51 × 71 × 1571219911
Prime factorization2 × 2 × 5 × 7 × 15721991
Divisors count242
Divisors1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 140, 157, 314, 628, 785, 1099, 1570, 2198, 3140, 4396, 5495, 10990, 219801, 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 210101011101110021010101111001112
Base 31010011002310100111113
Base 4111131304111132134
Base 51200410512004315
Base 624543262454516
Base 712104071210547
Base 8527348527478
Base 9331329331449
Base 1021980102199110
Base 1115572111558211
Base 1210878121088712
Base 13a00a13a01813
Base 14802014802b14
Base 1567a51567b115
Base 1655dc1655e716
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