21131539110 has 96 divisors (see below), whose sum is σ = 62542741248. Its totient is φ = 4900061760.

The previous prime is 21131539109. The next prime is 21131539139. The reversal of 21131539110 is 1193513112.

It is a happy number.

21131539110 is a `hidden beast` number, since 2 + 1 + 13 + 1 + 539 + 110 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 441252 + ... + 486791.

It is an arithmetic number, because the mean of its divisors is an integer number (651486888).

Almost surely, 2^21131539110 is an apocalyptic number.

21131539110 is an abundant number, since it is smaller than the sum of its proper divisors (41411202138).

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

21131539110 is a wasteful number, since it uses less digits than its factorization.

21131539110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 928090 (or 928087 counting only the distinct ones).

The product of its (nonzero) digits is 810, while the sum is 27.

The spelling of 21131539110 in words is "twenty-one billion, one hundred thirty-one million, five hundred thirty-nine thousand, one hundred ten".