31113100111220 has 96 divisors (see below), whose sum is σ = 66685524998400. Its totient is φ = 12189304617984.

The previous prime is 31113100111213. The next prime is 31113100111241. The reversal of 31113100111220 is 2211100131113.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1857822887 + ... + 1857839633.

It is an arithmetic number, because the mean of its divisors is an integer number (694640885400).

Almost surely, 2^{31113100111220} is an apocalyptic number.

It is an amenable number.

31113100111220 is an abundant number, since it is smaller than the sum of its proper divisors (35572424887180).

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

31113100111220 is a wasteful number, since it uses less digits than its factorization.

31113100111220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19737 (or 19735 counting only the distinct ones).

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

Adding to 31113100111220 its reverse (2211100131113), we get a palindrome (33324200242333).

The spelling of 31113100111220 in words is "thirty-one trillion, one hundred thirteen billion, one hundred million, one hundred eleven thousand, two hundred twenty".