31311111212 has 24 divisors (see below), whose sum is σ = 55109064192. Its totient is φ = 15565813200.

The previous prime is 31311111193. The next prime is 31311111229. The reversal of 31311111212 is 21211111313.

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, 852173 + ... + 888155.

It is an arithmetic number, because the mean of its divisors is an integer number (2296211008).

Almost surely, 2^31311111212 is an apocalyptic number.

It is an amenable number.

31311111212 is a deficient number, since it is larger than the sum of its proper divisors (23797952980).

31311111212 is a wasteful number, since it uses less digits than its factorization.

31311111212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37229 (or 37227 counting only the distinct ones).

The product of its digits is 36, while the sum is 17.

Adding to 31311111212 its reverse (21211111313), we get a palindrome (52522222525).

The spelling of 31311111212 in words is "thirty-one billion, three hundred eleven million, one hundred eleven thousand, two hundred twelve".