111102112021 has 4 divisors (see below), whose sum is σ = 113685882112. Its totient is φ = 108518341932.

The previous prime is 111102111997. The next prime is 111102112031. The reversal of 111102112021 is 120211201111.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 120211201111 = 31 ⋅3877780681.

It is a cyclic number.

It is not a de Polignac number, because 111102112021 - 2⁷ = 111102111893 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111102111992 and 111102112010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111102112031) 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, 1291884981 + ... + 1291885066.

It is an arithmetic number, because the mean of its divisors is an integer number (28421470528).

Almost surely, 2^111102112021 is an apocalyptic number.

It is an amenable number.

111102112021 is a deficient number, since it is larger than the sum of its proper divisors (2583770091).

111102112021 is an equidigital number, since it uses as much as digits as its factorization.

111102112021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2583770090.

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

Adding to 111102112021 its reverse (120211201111), we get a palindrome (231313313132).

The spelling of 111102112021 in words is "one hundred eleven billion, one hundred two million, one hundred twelve thousand, twenty-one".