31213331312 has 20 divisors (see below), whose sum is σ = 60544037136. Its totient is φ = 15589063680.

The previous prime is 31213331299. The next prime is 31213331327. The reversal of 31213331312 is 21313331213.

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 3 ways as a sum of consecutive naturals, for example, 1085489 + ... + 1113872.

Almost surely, 2^31213331312 is an apocalyptic number.

It is an amenable number.

31213331312 is a deficient number, since it is larger than the sum of its proper divisors (29330705824).

31213331312 is a wasteful number, since it uses less digits than its factorization.

31213331312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2200256 (or 2200250 counting only the distinct ones).

The product of its digits is 972, while the sum is 23.

Adding to 31213331312 its reverse (21313331213), we get a palindrome (52526662525).

Subtracting from 31213331312 its reverse (21313331213), we obtain a palindrome (9900000099).

The spelling of 31213331312 in words is "thirty-one billion, two hundred thirteen million, three hundred thirty-one thousand, three hundred twelve".