202100002121 has 2 divisors, whose sum is σ = 202100002122. Its totient is φ = 202100002120.

The previous prime is 202100002079. The next prime is 202100002127. The reversal of 202100002121 is 121200001202.

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., 183817987600 + 18282014521 = 428740^2 + 135211^2 .

It is a cyclic number.

It is not a de Polignac number, because 202100002121 - 2³⁰ = 201026260297 is a prime.

It is not a weakly prime, because it can be changed into another prime (202100002127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101050001060 + 101050001061.

It is an arithmetic number, because the mean of its divisors is an integer number (101050001061).

Almost surely, 2^202100002121 is an apocalyptic number.

It is an amenable number.

202100002121 is a deficient number, since it is larger than the sum of its proper divisors (1).

202100002121 is an equidigital number, since it uses as much as digits as its factorization.

202100002121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 202100002121 its reverse (121200001202), we get a palindrome (323300003323).

The spelling of 202100002121 in words is "two hundred two billion, one hundred million, two thousand, one hundred twenty-one".