31213121132 has 12 divisors (see below), whose sum is σ = 54637620576. Its totient is φ = 15602372400.

The previous prime is 31213121113. The next prime is 31213121161. The reversal of 31213121132 is 23112131213.

It is a happy number.

It is a super-2 number, since 2×31213121132² (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, 1030244 + ... + 1060107.

It is an arithmetic number, because the mean of its divisors is an integer number (4553135048).

Almost surely, 2^31213121132 is an apocalyptic number.

It is an amenable number.

31213121132 is a deficient number, since it is larger than the sum of its proper divisors (23424499444).

31213121132 is a wasteful number, since it uses less digits than its factorization.

31213121132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2094088 (or 2094086 counting only the distinct ones).

The product of its digits is 216, while the sum is 20.

Adding to 31213121132 its reverse (23112131213), we get a palindrome (54325252345).

The spelling of 31213121132 in words is "thirty-one billion, two hundred thirteen million, one hundred twenty-one thousand, one hundred thirty-two".