111110000021 has 4 divisors (see below), whose sum is σ = 111112286700. Its totient is φ = 111107713344.

The previous prime is 111110000011. The next prime is 111110000051. The reversal of 111110000021 is 120000011111.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 48854260900 + 62255739121 = 221030^2 + 249511^2 .

It is a cyclic number.

It is not a de Polignac number, because 111110000021 - 2¹⁸ = 111109737877 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111109999963 and 111110000008.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111110000011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1068836 + ... + 1168173.

It is an arithmetic number, because the mean of its divisors is an integer number (27778071675).

Almost surely, 2^111110000021 is an apocalyptic number.

It is an amenable number.

111110000021 is a deficient number, since it is larger than the sum of its proper divisors (2286679).

111110000021 is an equidigital number, since it uses as much as digits as its factorization.

111110000021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2286678.

The product of its (nonzero) digits is 2, while the sum is 8.

Adding to 111110000021 its reverse (120000011111), we get a palindrome (231110011132).

The spelling of 111110000021 in words is "one hundred eleven billion, one hundred ten million, twenty-one", and thus it is an aban number.