111110112120021 has 16 divisors (see below), whose sum is σ = 169311184111104. Its totient is φ = 63491291238384.

The previous prime is 111110112119969. The next prime is 111110112120041. The reversal of 111110112120021 is 120021211011111.

It is not a de Polignac number, because 111110112120021 - 2¹⁰ = 111110112118997 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111110112120041) 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, 1481571 + ... + 14980496.

It is an arithmetic number, because the mean of its divisors is an integer number (10581949006944).

Almost surely, 2^{111110112120021} is an apocalyptic number.

It is an amenable number.

111110112120021 is a deficient number, since it is larger than the sum of its proper divisors (58201071991083).

111110112120021 is a wasteful number, since it uses less digits than its factorization.

111110112120021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16783480.

The product of its (nonzero) digits is 8, while the sum is 15.

Adding to 111110112120021 its reverse (120021211011111), we get a palindrome (231131323131132).

The spelling of 111110112120021 in words is "one hundred eleven trillion, one hundred ten billion, one hundred twelve million, one hundred twenty thousand, twenty-one".