21013031432 has 16 divisors (see below), whose sum is σ = 39682885200. Its totient is φ = 10430928720.

The previous prime is 21013031411. The next prime is 21013031447. The reversal of 21013031432 is 23413031012.

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, 9447194 + ... + 9449417.

It is an arithmetic number, because the mean of its divisors is an integer number (2480180325).

Almost surely, 2^21013031432 is an apocalyptic number.

It is an amenable number.

21013031432 is a deficient number, since it is larger than the sum of its proper divisors (18669853768).

21013031432 is a wasteful number, since it uses less digits than its factorization.

21013031432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18896756 (or 18896752 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 21013031432 its reverse (23413031012), we get a palindrome (44426062444).

The spelling of 21013031432 in words is "twenty-one billion, thirteen million, thirty-one thousand, four hundred thirty-two".