21013000113 has 32 divisors (see below), whose sum is σ = 32687872000. Its totient is φ = 12002065488.

The previous prime is 21013000109. The next prime is 21013000139. The reversal of 21013000113 is 31100031012.

It is not a de Polignac number, because 21013000113 - 2² = 21013000109 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21013000513) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4054758 + ... + 4059936.

It is an arithmetic number, because the mean of its divisors is an integer number (1021496000).

Almost surely, 2^21013000113 is an apocalyptic number.

It is an amenable number.

21013000113 is a deficient number, since it is larger than the sum of its proper divisors (11674871887).

21013000113 is an equidigital number, since it uses as much as digits as its factorization.

21013000113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9146 (or 9132 counting only the distinct ones).

The product of its (nonzero) digits is 18, while the sum is 12.

Adding to 21013000113 its reverse (31100031012), we get a palindrome (52113031125).

The spelling of 21013000113 in words is "twenty-one billion, thirteen million, one hundred thirteen", and thus it is an aban number.