210002200210021 has 4 divisors (see below), whose sum is σ = 210003574390092. Its totient is φ = 210000826029952.

The previous prime is 210002200209983. The next prime is 210002200210039. The reversal of 210002200210021 is 120012002200012.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 22281099921796 + 187721100288225 = 4720286^2 + 13701135^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-210002200210021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210002200209983 and 210002200210010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210002200217021) 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, 686860780 + ... + 687166453.

It is an arithmetic number, because the mean of its divisors is an integer number (52500893597523).

Almost surely, 2^{210002200210021} is an apocalyptic number.

It is an amenable number.

210002200210021 is a deficient number, since it is larger than the sum of its proper divisors (1374180071).

210002200210021 is a wasteful number, since it uses less digits than its factorization.

210002200210021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1374180070.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 210002200210021 its reverse (120012002200012), we get a palindrome (330014202410033).

The spelling of 210002200210021 in words is "two hundred ten trillion, two billion, two hundred million, two hundred ten thousand, twenty-one".