210210202002121 has 2 divisors, whose sum is σ = 210210202002122. Its totient is φ = 210210202002120.

The previous prime is 210210202002113. The next prime is 210210202002127. The reversal of 210210202002121 is 121200202012012.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 141900985328400 + 68309216673721 = 11912220^2 + 8264939^2 .

It is a cyclic number.

It is not a de Polignac number, because 210210202002121 - 2³ = 210210202002113 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 210210202002095 and 210210202002104.

It is not a weakly prime, because it can be changed into another prime (210210202002127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105105101001060 + 105105101001061.

It is an arithmetic number, because the mean of its divisors is an integer number (105105101001061).

Almost surely, 2^{210210202002121} is an apocalyptic number.

It is an amenable number.

210210202002121 is a deficient number, since it is larger than the sum of its proper divisors (1).

210210202002121 is an equidigital number, since it uses as much as digits as its factorization.

210210202002121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 210210202002121 its reverse (121200202012012), we get a palindrome (331410404014133).

The spelling of 210210202002121 in words is "two hundred ten trillion, two hundred ten billion, two hundred two million, two thousand, one hundred twenty-one".