202021202121 has 32 divisors (see below), whose sum is σ = 294268584960. Its totient is φ = 122884179264.

The previous prime is 202021202087. The next prime is 202021202143. The reversal of 202021202121 is 121202120202.

202021202121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 202021202121 - 2²⁵ = 201987647689 is a prime.

It is a super-2 number, since 2×202021202121² (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 202021202121.

It is not an unprimeable number, because it can be changed into a prime (202021201121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 442111 + ... + 774276.

It is an arithmetic number, because the mean of its divisors is an integer number (9195893280).

Almost surely, 2^202021202121 is an apocalyptic number.

It is an amenable number.

202021202121 is a deficient number, since it is larger than the sum of its proper divisors (92247382839).

202021202121 is a wasteful number, since it uses less digits than its factorization.

202021202121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1216525.

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

Adding to 202021202121 its reverse (121202120202), we get a palindrome (323223322323).

The spelling of 202021202121 in words is "two hundred two billion, twenty-one million, two hundred two thousand, one hundred twenty-one".