111112120000021 has 16 divisors (see below), whose sum is σ = 127131236204544. Its totient is φ = 95129496496944.

The previous prime is 111112120000001. The next prime is 111112120000043. The reversal of 111112120000021 is 120000021211111.

It is a happy number.

It is not a de Polignac number, because 111112120000021 - 2⁵ = 111112119999989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111112119999956 and 111112120000010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111112120000001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 499208460 + ... + 499430986.

It is an arithmetic number, because the mean of its divisors is an integer number (7945702262784).

Almost surely, 2^{111112120000021} is an apocalyptic number.

It is an amenable number.

111112120000021 is a deficient number, since it is larger than the sum of its proper divisors (16019116204523).

111112120000021 is an equidigital number, since it uses as much as digits as its factorization.

111112120000021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 304200.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 111112120000021 its reverse (120000021211111), we get a palindrome (231112141211132).

The spelling of 111112120000021 in words is "one hundred eleven trillion, one hundred twelve billion, one hundred twenty million, twenty-one", and thus it is an aban number.