111100110021 has 24 divisors (see below), whose sum is σ = 165400662336. Its totient is φ = 71816880960.

The previous prime is 111100109993. The next prime is 111100110061. The reversal of 111100110021 is 120011001111.

It is not a de Polignac number, because 111100110021 - 2¹³ = 111100101829 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 111100109985 and 111100110012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111100110061) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 863425 + ... + 983718.

It is an arithmetic number, because the mean of its divisors is an integer number (6891694264).

Almost surely, 2^111100110021 is an apocalyptic number.

It is an amenable number.

111100110021 is a deficient number, since it is larger than the sum of its proper divisors (54300552315).

111100110021 is a wasteful number, since it uses less digits than its factorization.

111100110021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1847353 (or 1847350 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 9.

Adding to 111100110021 its reverse (120011001111), we get a palindrome (231111111132).

The spelling of 111100110021 in words is "one hundred eleven billion, one hundred million, one hundred ten thousand, twenty-one".