202122122121221 has 4 divisors (see below), whose sum is σ = 203251295988000. Its totient is φ = 200992948254444.

The previous prime is 202122122121209. The next prime is 202122122121223. The reversal of 202122122121221 is 122121221221202.

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 202122122121221 - 2²⁶ = 202122055012357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202122122121223) 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, 564586933121 + ... + 564586933478.

It is an arithmetic number, because the mean of its divisors is an integer number (50812823997000).

Almost surely, 2^{202122122121221} is an apocalyptic number.

It is an amenable number.

202122122121221 is a deficient number, since it is larger than the sum of its proper divisors (1129173866779).

202122122121221 is a wasteful number, since it uses less digits than its factorization.

202122122121221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1129173866778.

The product of its (nonzero) digits is 512, while the sum is 23.

Adding to 202122122121221 its reverse (122121221221202), we get a palindrome (324243343342423).

The spelling of 202122122121221 in words is "two hundred two trillion, one hundred twenty-two billion, one hundred twenty-two million, one hundred twenty-one thousand, two hundred twenty-one".