111312111020 has 24 divisors (see below), whose sum is σ = 255005927568. Its totient is φ = 40477131200.

The previous prime is 111312111019. The next prime is 111312111041. The reversal of 111312111020 is 20111213111.

It is a junction number, because it is equal to n+sod(n) for n = 111312110986 and 111312111004.

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, 252981851 + ... + 252982290.

It is an arithmetic number, because the mean of its divisors is an integer number (10625246982).

Almost surely, 2^111312111020 is an apocalyptic number.

111312111020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

111312111020 is an abundant number, since it is smaller than the sum of its proper divisors (143693816548).

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

111312111020 is a wasteful number, since it uses less digits than its factorization.

111312111020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 505964161 (or 505964159 counting only the distinct ones).

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

Adding to 111312111020 its reverse (20111213111), we get a palindrome (131423324131).

The spelling of 111312111020 in words is "one hundred eleven billion, three hundred twelve million, one hundred eleven thousand, twenty".