2100111221021 has 4 divisors (see below), whose sum is σ = 2291030422944. Its totient is φ = 1909192019100.

The previous prime is 2100111221017. The next prime is 2100111221027. The reversal of 2100111221021 is 1201221110012.

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 2100111221021 - 2² = 2100111221017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2100111220987 and 2100111221005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2100111221027) 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, 95459600945 + ... + 95459600966.

It is an arithmetic number, because the mean of its divisors is an integer number (572757605736).

Almost surely, 2^{2100111221021} is an apocalyptic number.

It is an amenable number.

2100111221021 is a deficient number, since it is larger than the sum of its proper divisors (190919201923).

2100111221021 is a wasteful number, since it uses less digits than its factorization.

2100111221021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190919201922.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 2100111221021 its reverse (1201221110012), we get a palindrome (3301332331033).

The spelling of 2100111221021 in words is "two trillion, one hundred billion, one hundred eleven million, two hundred twenty-one thousand, twenty-one".