2100002200021 has 4 divisors (see below), whose sum is σ = 2290911490944. Its totient is φ = 1909092909100.

The previous prime is 2100002199959. The next prime is 2100002200027. The reversal of 2100002200021 is 1200022000012.

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 2100002200021 - 2²⁷ = 2099867982293 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2100002199980 and 2100002200007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2100002200027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 95454645445 + ... + 95454645466.

It is an arithmetic number, because the mean of its divisors is an integer number (572727872736).

Almost surely, 2^{2100002200021} is an apocalyptic number.

It is an amenable number.

2100002200021 is a deficient number, since it is larger than the sum of its proper divisors (190909290923).

2100002200021 is a wasteful number, since it uses less digits than its factorization.

2100002200021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190909290922.

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 2100002200021 its reverse (1200022000012), we get a palindrome (3300024200033).

The spelling of 2100002200021 in words is "two trillion, one hundred billion, two million, two hundred thousand, twenty-one".