21311013102 has 64 divisors (see below), whose sum is σ = 46145562624. Its totient is φ = 6536908800.

The previous prime is 21311013083. The next prime is 21311013133. The reversal of 21311013102 is 20131011312.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 808227 + ... + 834177.

It is an arithmetic number, because the mean of its divisors is an integer number (721024416).

Almost surely, 2^21311013102 is an apocalyptic number.

21311013102 is an abundant number, since it is smaller than the sum of its proper divisors (24834549522).

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

21311013102 is a wasteful number, since it uses less digits than its factorization.

21311013102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26153.

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 21311013102 its reverse (20131011312), we get a palindrome (41442024414).

The spelling of 21311013102 in words is "twenty-one billion, three hundred eleven million, thirteen thousand, one hundred two".