111220101112021 has 16 divisors (see below), whose sum is σ = 125139387241728. Its totient is φ = 97978142152000.

The previous prime is 111220101111989. The next prime is 111220101112033. The reversal of 111220101112021 is 120211101022111.

It is not a de Polignac number, because 111220101112021 - 2⁵ = 111220101111989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111220101111986 and 111220101112004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111220101112121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1064927590 + ... + 1065032023.

It is an arithmetic number, because the mean of its divisors is an integer number (7821211702608).

Almost surely, 2^{111220101112021} is an apocalyptic number.

111220101112021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

111220101112021 is a deficient number, since it is larger than the sum of its proper divisors (13919286129707).

111220101112021 is a wasteful number, since it uses less digits than its factorization.

111220101112021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2129959772.

The product of its (nonzero) digits is 16, while the sum is 16.

Adding to 111220101112021 its reverse (120211101022111), we get a palindrome (231431202134132).

The spelling of 111220101112021 in words is "one hundred eleven trillion, two hundred twenty billion, one hundred one million, one hundred twelve thousand, twenty-one".