21131112032 has 24 divisors (see below), whose sum is σ = 42726254256. Its totient is φ = 10279999872.

The previous prime is 21131111959. The next prime is 21131112109. The reversal of 21131112032 is 23021113112.

It is a self number, because there is not a number n which added to its sum of digits gives 21131112032.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8922428 + ... + 8924795.

It is an arithmetic number, because the mean of its divisors is an integer number (1780260594).

Almost surely, 2^21131112032 is an apocalyptic number.

It is an amenable number.

21131112032 is an abundant number, since it is smaller than the sum of its proper divisors (21595142224).

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

21131112032 is a wasteful number, since it uses less digits than its factorization.

21131112032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17847270 (or 17847262 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 21131112032 its reverse (23021113112), we get a palindrome (44152225144).

The spelling of 21131112032 in words is "twenty-one billion, one hundred thirty-one million, one hundred twelve thousand, thirty-two".