202002122121 has 4 divisors (see below), whose sum is σ = 269336162832. Its totient is φ = 134668081412.

The previous prime is 202002122089. The next prime is 202002122131. The reversal of 202002122121 is 121221200202.

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 202002122121 - 2⁵ = 202002122089 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 202002122121.

It is not an unprimeable number, because it can be changed into a prime (202002122131) 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, 33667020351 + ... + 33667020356.

It is an arithmetic number, because the mean of its divisors is an integer number (67334040708).

Almost surely, 2^202002122121 is an apocalyptic number.

It is an amenable number.

202002122121 is a deficient number, since it is larger than the sum of its proper divisors (67334040711).

202002122121 is an equidigital number, since it uses as much as digits as its factorization.

202002122121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67334040710.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 202002122121 its reverse (121221200202), we get a palindrome (323223322323).

The spelling of 202002122121 in words is "two hundred two billion, two million, one hundred twenty-two thousand, one hundred twenty-one".