111120210100021 has 4 divisors (see below), whose sum is σ = 111130607809792. Its totient is φ = 111109812390252.

The previous prime is 111120210100019. The next prime is 111120210100027. The reversal of 111120210100021 is 120001012021111.

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.

It is a cyclic number.

It is not a de Polignac number, because 111120210100021 - 2¹ = 111120210100019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111120210099974 and 111120210100010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111120210100027) 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, 5198838855 + ... + 5198860228.

It is an arithmetic number, because the mean of its divisors is an integer number (27782651952448).

Almost surely, 2^{111120210100021} is an apocalyptic number.

It is an amenable number.

111120210100021 is a deficient number, since it is larger than the sum of its proper divisors (10397709771).

111120210100021 is a wasteful number, since it uses less digits than its factorization.

111120210100021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10397709770.

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

Adding to 111120210100021 its reverse (120001012021111), we get a palindrome (231121222121132).

The spelling of 111120210100021 in words is "one hundred eleven trillion, one hundred twenty billion, two hundred ten million, one hundred thousand, twenty-one".