21100131012 has 12 divisors (see below), whose sum is σ = 49233639056. Its totient is φ = 7033377000.

The previous prime is 21100130983. The next prime is 21100131029. The reversal of 21100131012 is 21013100112.

It is a tau number, because it is divible by the number of its divisors (12).

It is a Harshad number since it is a multiple of its sum of digits (12), and also a Moran number because the ratio is a prime number: 1758344251 = 21100131012 / (2 + 1 + 1 + 0 + 0 + 1 + 3 + 1 + 0 + 1 + 2).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 879172114 + ... + 879172137.

Almost surely, 2^21100131012 is an apocalyptic number.

It is an amenable number.

21100131012 is an abundant number, since it is smaller than the sum of its proper divisors (28133508044).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21100131012 is a wasteful number, since it uses less digits than its factorization.

21100131012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1758344258 (or 1758344256 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 12.

Adding to 21100131012 its reverse (21013100112), we get a palindrome (42113231124).

The spelling of 21100131012 in words is "twenty-one billion, one hundred million, one hundred thirty-one thousand, twelve".