202120220121 has 16 divisors (see below), whose sum is σ = 288958176000. Its totient is φ = 125215204608.

The previous prime is 202120220089. The next prime is 202120220129. The reversal of 202120220121 is 121022021202.

It is not a de Polignac number, because 202120220121 - 2⁵ = 202120220089 is a prime.

It is a super-2 number, since 2×202120220121² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 202120220121.

It is not an unprimeable number, because it can be changed into a prime (202120220129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25079146 + ... + 25087203.

It is an arithmetic number, because the mean of its divisors is an integer number (18059886000).

Almost surely, 2^202120220121 is an apocalyptic number.

It is an amenable number.

202120220121 is a deficient number, since it is larger than the sum of its proper divisors (86837955879).

202120220121 is a wasteful number, since it uses less digits than its factorization.

202120220121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50166448.

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

Adding to 202120220121 its reverse (121022021202), we get a palindrome (323142241323).

The spelling of 202120220121 in words is "two hundred two billion, one hundred twenty million, two hundred twenty thousand, one hundred twenty-one".