111100202100021 has 4 divisors (see below), whose sum is σ = 148133602800032. Its totient is φ = 74066801400012.

The previous prime is 111100202099993. The next prime is 111100202100029. The reversal of 111100202100021 is 120001202001111.

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 de Polignac number, because none of the positive numbers 2^k-111100202100021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111100202100029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18516700350001 + ... + 18516700350006.

It is an arithmetic number, because the mean of its divisors is an integer number (37033400700008).

Almost surely, 2^{111100202100021} is an apocalyptic number.

It is an amenable number.

111100202100021 is a deficient number, since it is larger than the sum of its proper divisors (37033400700011).

111100202100021 is an equidigital number, since it uses as much as digits as its factorization.

111100202100021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37033400700010.

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

Adding to 111100202100021 its reverse (120001202001111), we get a palindrome (231101404101132).

The spelling of 111100202100021 in words is "one hundred eleven trillion, one hundred billion, two hundred two million, one hundred thousand, twenty-one".