31111110212 has 48 divisors (see below), whose sum is σ = 67023288192. Its totient is φ = 12304984320.

The previous prime is 31111110203. The next prime is 31111110271. The reversal of 31111110212 is 21201111113.

It is a Harshad number since it is a multiple of its sum of digits (14).

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, 2793968 + ... + 2805080.

It is an arithmetic number, because the mean of its divisors is an integer number (1396318504).

Almost surely, 2^31111110212 is an apocalyptic number.

It is an amenable number.

31111110212 is an abundant number, since it is smaller than the sum of its proper divisors (35912177980).

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

31111110212 is a wasteful number, since it uses less digits than its factorization.

31111110212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18828 (or 18826 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 14.

Adding to 31111110212 its reverse (21201111113), we get a palindrome (52312221325).

Subtracting from 31111110212 its reverse (21201111113), we obtain a palindrome (9909999099).

The spelling of 31111110212 in words is "thirty-one billion, one hundred eleven million, one hundred ten thousand, two hundred twelve".