21231112110 has 32 divisors (see below), whose sum is σ = 54874260000. Its totient is φ = 5226119808.

The previous prime is 21231112109. The next prime is 21231112127. The reversal of 21231112110 is 1121113212.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 21231112110.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27218985 + ... + 27219764.

It is an arithmetic number, because the mean of its divisors is an integer number (1714820625).

Almost surely, 2^21231112110 is an apocalyptic number.

21231112110 is an abundant number, since it is smaller than the sum of its proper divisors (33643147890).

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

21231112110 is a wasteful number, since it uses less digits than its factorization.

21231112110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54438772.

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 21231112110 its reverse (1121113212), we get a palindrome (22352225322).

The spelling of 21231112110 in words is "twenty-one billion, two hundred thirty-one million, one hundred twelve thousand, one hundred ten".