31213021132 has 12 divisors (see below), whose sum is σ = 54798425136. Its totient is φ = 15556328240.

The previous prime is 31213021093. The next prime is 31213021157. The reversal of 31213021132 is 23112031213.

It is a super-2 number, since 2×31213021132² (a number of 22 digits) contains 22 as substring.

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, 12544183 + ... + 12546670.

It is an arithmetic number, because the mean of its divisors is an integer number (4566535428).

Almost surely, 2^31213021132 is an apocalyptic number.

It is an amenable number.

31213021132 is a deficient number, since it is larger than the sum of its proper divisors (23585404004).

31213021132 is a wasteful number, since it uses less digits than its factorization.

31213021132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25091168 (or 25091166 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 31213021132 its reverse (23112031213), we get a palindrome (54325052345).

The spelling of 31213021132 in words is "thirty-one billion, two hundred thirteen million, twenty-one thousand, one hundred thirty-two".