111102120021 has 4 divisors (see below), whose sum is σ = 148136160032. Its totient is φ = 74068080012.

The previous prime is 111102120013. The next prime is 111102120049. The reversal of 111102120021 is 120021201111.

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.

It is not a de Polignac number, because 111102120021 - 2³ = 111102120013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111102119979 and 111102120006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111102120001) 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, 18517020001 + ... + 18517020006.

It is an arithmetic number, because the mean of its divisors is an integer number (37034040008).

Almost surely, 2^111102120021 is an apocalyptic number.

It is an amenable number.

111102120021 is a deficient number, since it is larger than the sum of its proper divisors (37034040011).

111102120021 is an equidigital number, since it uses as much as digits as its factorization.

111102120021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37034040010.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 111102120021 its reverse (120021201111), we get a palindrome (231123321132).

The spelling of 111102120021 in words is "one hundred eleven billion, one hundred two million, one hundred twenty thousand, twenty-one".