111211012020 has 48 divisors (see below), whose sum is σ = 313842751488. Its totient is φ = 29422753920.

The previous prime is 111211012001. The next prime is 111211012057. The reversal of 111211012020 is 20210112111.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 111211011987 and 111211012005.

It is a congruent number.

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, 7289691 + ... + 7304930.

It is an arithmetic number, because the mean of its divisors is an integer number (6538390656).

Almost surely, 2^111211012020 is an apocalyptic number.

111211012020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

111211012020 is an abundant number, since it is smaller than the sum of its proper divisors (202631739468).

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

111211012020 is a wasteful number, since it uses less digits than its factorization.

111211012020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14594760 (or 14594758 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 111211012020 its reverse (20210112111), we get a palindrome (131421124131).

The spelling of 111211012020 in words is "one hundred eleven billion, two hundred eleven million, twelve thousand, twenty".