21231431032 has 32 divisors (see below), whose sum is σ = 46963537920. Its totient is φ = 8805661920.

The previous prime is 21231431029. The next prime is 21231431069. The reversal of 21231431032 is 23013413212.

It is a junction number, because it is equal to n+sod(n) for n = 21231430994 and 21231431012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6113308 + ... + 6116779.

It is an arithmetic number, because the mean of its divisors is an integer number (1467610560).

Almost surely, 2^21231431032 is an apocalyptic number.

It is an amenable number.

21231431032 is an abundant number, since it is smaller than the sum of its proper divisors (25732106888).

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

21231431032 is a wasteful number, since it uses less digits than its factorization.

21231431032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12230131 (or 12230127 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 21231431032 its reverse (23013413212), we get a palindrome (44244844244).

The spelling of 21231431032 in words is "twenty-one billion, two hundred thirty-one million, four hundred thirty-one thousand, thirty-two".