111110120021 has 8 divisors (see below), whose sum is σ = 121702768920. Its totient is φ = 100968222208.

The previous prime is 111110120003. The next prime is 111110120039. The reversal of 111110120021 is 120021011111.

It is an interprime number because it is at equal distance from previous prime (111110120003) and next prime (111110120039).

It can be written as a sum of positive squares in 4 ways, for example, as 44736903121 + 66373216900 = 211511^2 + 257630^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111110120021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111110119984 and 111110120011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111110120041) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 112687256 + ... + 112688241.

It is an arithmetic number, because the mean of its divisors is an integer number (15212846115).

Almost surely, 2^111110120021 is an apocalyptic number.

It is an amenable number.

111110120021 is a deficient number, since it is larger than the sum of its proper divisors (10592648899).

111110120021 is a wasteful number, since it uses less digits than its factorization.

111110120021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225375543.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 111110120021 its reverse (120021011111), we get a palindrome (231131131132).

The spelling of 111110120021 in words is "one hundred eleven billion, one hundred ten million, one hundred twenty thousand, twenty-one".