21100121122012 has 24 divisors (see below), whose sum is σ = 38119780211072. Its totient is φ = 10208816640000.

The previous prime is 21100121121997. The next prime is 21100121122037. The reversal of 21100121122012 is 21022112100112.

It is a super-2 number, since 2×21100121122012² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6277989 + ... + 9034012.

Almost surely, 2^{21100121122012} is an apocalyptic number.

It is an amenable number.

21100121122012 is a deficient number, since it is larger than the sum of its proper divisors (17019659089060).

21100121122012 is a wasteful number, since it uses less digits than its factorization.

21100121122012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15323149 (or 15323147 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21100121122012 its reverse (21022112100112), we get a palindrome (42122233222124).

The spelling of 21100121122012 in words is "twenty-one trillion, one hundred billion, one hundred twenty-one million, one hundred twenty-two thousand, twelve".