31112111020 has 12 divisors (see below), whose sum is σ = 65335433184. Its totient is φ = 12444844400.

The previous prime is 31112111011. The next prime is 31112111029. The reversal of 31112111020 is 2011121113.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (31112111011) and next prime (31112111029).

It is not an unprimeable number, because it can be changed into a prime (31112111029) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 777802756 + ... + 777802795.

It is an arithmetic number, because the mean of its divisors is an integer number (5444619432).

Almost surely, 2^31112111020 is an apocalyptic number.

It is an amenable number.

31112111020 is an abundant number, since it is smaller than the sum of its proper divisors (34223322164).

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

31112111020 is a wasteful number, since it uses less digits than its factorization.

31112111020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1555605560 (or 1555605558 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 13.

Adding to 31112111020 its reverse (2011121113), we get a palindrome (33123232133).

The spelling of 31112111020 in words is "thirty-one billion, one hundred twelve million, one hundred eleven thousand, twenty".