31312123212 has 48 divisors (see below), whose sum is σ = 73373603072. Its totient is φ = 10392857280.

The previous prime is 31312123207. The next prime is 31312123231. The reversal of 31312123212 is 21232121313.

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 15 ways as a sum of consecutive naturals, for example, 8916537 + ... + 8920047.

Almost surely, 2^31312123212 is an apocalyptic number.

It is an amenable number.

31312123212 is an abundant number, since it is smaller than the sum of its proper divisors (42061479860).

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

31312123212 is a wasteful number, since it uses less digits than its factorization.

31312123212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6478 (or 6476 counting only the distinct ones).

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

Adding to 31312123212 its reverse (21232121313), we get a palindrome (52544244525).

The spelling of 31312123212 in words is "thirty-one billion, three hundred twelve million, one hundred twenty-three thousand, two hundred twelve".