31213222212 has 24 divisors (see below), whose sum is σ = 73581688096. Its totient is φ = 10297145088.

The previous prime is 31213222207. The next prime is 31213222259. The reversal of 31213222212 is 21222231213.

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

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13406578 + ... + 13408905.

Almost surely, 2^31213222212 is an apocalyptic number.

It is an amenable number.

31213222212 is an abundant number, since it is smaller than the sum of its proper divisors (42368465884).

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

31213222212 is a wasteful number, since it uses less digits than its factorization.

31213222212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26815587 (or 26815585 counting only the distinct ones).

The product of its digits is 576, while the sum is 21.

Adding to 31213222212 its reverse (21222231213), we get a palindrome (52435453425).

Subtracting from 31213222212 its reverse (21222231213), we obtain a palindrome (9990990999).

The spelling of 31213222212 in words is "thirty-one billion, two hundred thirteen million, two hundred twenty-two thousand, two hundred twelve".