1. Numbers
  2. Compare 21991 vs 21991

Compare 21991 vs 21991

Property2199121991
Typeprimeprime
Unique factors11
Total factors11
Prime factorization219911219911
Prime factorization2199121991
Divisors count22
Divisors1, 219911, 21991
Number of properties55
Chen primes1208th1208th
Isolated primes1720th1720th
Primes2463rd2463rd
Sexy primes (1st member)742nd742nd
Sexy prime triplets (1st member)202nd202nd
Roman numberals  
Base 210101011110011121010101111001112
Base 31010011111310100111113
Base 4111132134111132134
Base 51200431512004315
Base 624545162454516
Base 712105471210547
Base 8527478527478
Base 9331449331449
Base 1021991102199110
Base 1115582111558211
Base 1210887121088712
Base 13a01813a01813
Base 14802b14802b14
Base 1567b11567b115
Base 1655e71655e716
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