31213212312 has 48 divisors (see below), whose sum is σ = 82356213240. Its totient is φ = 9856801152.

The previous prime is 31213212307. The next prime is 31213212361. The reversal of 31213212312 is 21321231213.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

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 11 ways as a sum of consecutive naturals, for example, 1792653 + ... + 1809980.

Almost surely, 2^31213212312 is an apocalyptic number.

It is an amenable number.

31213212312 is an abundant number, since it is smaller than the sum of its proper divisors (51143000928).

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

31213212312 is a wasteful number, since it uses less digits than its factorization.

31213212312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3602680 (or 3602657 counting only the distinct ones).

The product of its digits is 432, while the sum is 21.

Adding to 31213212312 its reverse (21321231213), we get a palindrome (52534443525).

The spelling of 31213212312 in words is "thirty-one billion, two hundred thirteen million, two hundred twelve thousand, three hundred twelve".