111220100000020 has 96 divisors (see below), whose sum is σ = 265879888404480. Its totient is φ = 38684277202560.

The previous prime is 111220099999999. The next prime is 111220100000039. The reversal of 111220100000020 is 20000001022111.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 111220099999952 and 111220100000006.

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, 217420669 + ... + 217931611.

It is an arithmetic number, because the mean of its divisors is an integer number (2769582170880).

Almost surely, 2^{111220100000020} is an apocalyptic number.

111220100000020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

111220100000020 is an abundant number, since it is smaller than the sum of its proper divisors (154659788404460).

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

111220100000020 is a wasteful number, since it uses less digits than its factorization.

111220100000020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 554005 (or 554003 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 111220100000020 its reverse (20000001022111), we get a palindrome (131220101022131).

The spelling of 111220100000020 in words is "one hundred eleven trillion, two hundred twenty billion, one hundred million, twenty", and thus it is an aban number.