31321031232 has 112 divisors (see below), whose sum is σ = 87498732800. Its totient is φ = 9860590080.

The previous prime is 31321031219. The next prime is 31321031249. The reversal of 31321031232 is 23213012313.

It is a junction number, because it is equal to n+sod(n) for n = 31321031199 and 31321031208.

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, 1194519 + ... + 1220457.

Almost surely, 2^31321031232 is an apocalyptic number.

31321031232 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31321031232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43749366400).

31321031232 is an abundant number, since it is smaller than the sum of its proper divisors (56177701568).

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

31321031232 is a wasteful number, since it uses less digits than its factorization.

31321031232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26304 (or 26294 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 31321031232 its reverse (23213012313), we get a palindrome (54534043545).

The spelling of 31321031232 in words is "thirty-one billion, three hundred twenty-one million, thirty-one thousand, two hundred thirty-two".