31212220132 has 24 divisors (see below), whose sum is σ = 57606625440. Its totient is φ = 14756339520.

The previous prime is 31212220103. The next prime is 31212220147. The reversal of 31212220132 is 23102221213.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 354538 + ... + 433729.

It is an arithmetic number, because the mean of its divisors is an integer number (2400276060).

Almost surely, 2^31212220132 is an apocalyptic number.

It is an amenable number.

31212220132 is a deficient number, since it is larger than the sum of its proper divisors (26394405308).

31212220132 is a wasteful number, since it uses less digits than its factorization.

31212220132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 788811 (or 788809 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 31212220132 its reverse (23102221213), we get a palindrome (54314441345).

The spelling of 31212220132 in words is "thirty-one billion, two hundred twelve million, two hundred twenty thousand, one hundred thirty-two".