31213013132 has 36 divisors (see below), whose sum is σ = 67278476664. Its totient is φ = 12590121600.

The previous prime is 31213013119. The next prime is 31213013137. The reversal of 31213013132 is 23131031213.

It is not an unprimeable number, because it can be changed into a prime (31213013137) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4680494 + ... + 4687157.

It is an arithmetic number, because the mean of its divisors is an integer number (1868846574).

Almost surely, 2^31213013132 is an apocalyptic number.

It is an amenable number.

31213013132 is an abundant number, since it is smaller than the sum of its proper divisors (36065463532).

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

31213013132 is a wasteful number, since it uses less digits than its factorization.

31213013132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9367686 (or 9367677 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 20.

Adding to 31213013132 its reverse (23131031213), we get a palindrome (54344044345).

The spelling of 31213013132 in words is "thirty-one billion, two hundred thirteen million, thirteen thousand, one hundred thirty-two".