31213103312 has 20 divisors (see below), whose sum is σ = 60478916676. Its totient is φ = 15605640960.

The previous prime is 31213103297. The next prime is 31213103371. The reversal of 31213103312 is 21330131213.

It can be written as a sum of positive squares in 2 ways, for example, as 5860821136 + 25352282176 = 76556^2 + 159224^2 .

It is a congruent number.

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, 289862 + ... + 382682.

Almost surely, 2^31213103312 is an apocalyptic number.

It is an amenable number.

31213103312 is a deficient number, since it is larger than the sum of its proper divisors (29265813364).

31213103312 is a wasteful number, since it uses less digits than its factorization.

31213103312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113846 (or 113840 counting only the distinct ones).

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

Adding to 31213103312 its reverse (21330131213), we get a palindrome (52543234525).

The spelling of 31213103312 in words is "thirty-one billion, two hundred thirteen million, one hundred three thousand, three hundred twelve".