202102222121 has 4 divisors (see below), whose sum is σ = 212739181200. Its totient is φ = 191465263044.

The previous prime is 202102222099. The next prime is 202102222139. The reversal of 202102222121 is 121222201202.

It is a happy number.

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 202102222121 - 2⁶ = 202102222057 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 202102222121.

It is not an unprimeable number, because it can be changed into a prime (202102222171) 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, 5318479511 + ... + 5318479548.

It is an arithmetic number, because the mean of its divisors is an integer number (53184795300).

Almost surely, 2^202102222121 is an apocalyptic number.

It is an amenable number.

202102222121 is a deficient number, since it is larger than the sum of its proper divisors (10636959079).

202102222121 is a wasteful number, since it uses less digits than its factorization.

202102222121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10636959078.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 202102222121 its reverse (121222201202), we get a palindrome (323324423323).

The spelling of 202102222121 in words is "two hundred two billion, one hundred two million, two hundred twenty-two thousand, one hundred twenty-one".