210002200021 has 2 divisors, whose sum is σ = 210002200022. Its totient is φ = 210002200020.

The previous prime is 210002200007. The next prime is 210002200043. The reversal of 210002200021 is 120002200012.

210002200021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 205468197796 + 4534002225 = 453286^2 + 67335^2 .

It is a cyclic number.

It is not a de Polignac number, because 210002200021 - 2⁹ = 210002199509 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 210002199980 and 210002200007.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (210002200061) 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 as a sum of consecutive naturals, namely, 105001100010 + 105001100011.

It is an arithmetic number, because the mean of its divisors is an integer number (105001100011).

Almost surely, 2^210002200021 is an apocalyptic number.

It is an amenable number.

210002200021 is a deficient number, since it is larger than the sum of its proper divisors (1).

210002200021 is an equidigital number, since it uses as much as digits as its factorization.

210002200021 is an odious number, because the sum of its binary digits is odd.

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

Adding to 210002200021 its reverse (120002200012), we get a palindrome (330004400033).

Subtracting from 210002200021 its reverse (120002200012), we obtain a palindrome (90000000009).

The spelling of 210002200021 in words is "two hundred ten billion, two million, two hundred thousand, twenty-one".