202100222121 has 24 divisors (see below), whose sum is σ = 313508527200. Its totient is φ = 115468540992.

The previous prime is 202100222113. The next prime is 202100222123. The reversal of 202100222121 is 121222001202.

It is not a de Polignac number, because 202100222121 - 2³ = 202100222113 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 202100222121.

It is not an unprimeable number, because it can be changed into a prime (202100222123) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 915805 + ... + 1114853.

It is an arithmetic number, because the mean of its divisors is an integer number (13062855300).

Almost surely, 2^202100222121 is an apocalyptic number.

202100222121 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

202100222121 is a deficient number, since it is larger than the sum of its proper divisors (111408305079).

202100222121 is a wasteful number, since it uses less digits than its factorization.

202100222121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205973 (or 205966 counting only the distinct ones).

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

Adding to 202100222121 its reverse (121222001202), we get a palindrome (323322223323).

The spelling of 202100222121 in words is "two hundred two billion, one hundred million, two hundred twenty-two thousand, one hundred twenty-one".