202142121 has 16 divisors (see below), whose sum is σ = 300398400. Its totient is φ = 120158208.

The previous prime is 202142117. The next prime is 202142123. The reversal of 202142121 is 121241202.

It is not a de Polignac number, because 202142121 - 2² = 202142117 is a prime.

It is a super-2 number, since 2×202142121² = 81722874164757282, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 202142121.

It is not an unprimeable number, because it can be changed into a prime (202142123) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 103336 + ... + 105273.

It is an arithmetic number, because the mean of its divisors is an integer number (18774900).

Almost surely, 2^202142121 is an apocalyptic number.

It is an amenable number.

202142121 is a deficient number, since it is larger than the sum of its proper divisors (98256279).

202142121 is a wasteful number, since it uses less digits than its factorization.

202142121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208648.

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

The square root of 202142121 is about 14217.6693237675. The cubic root of 202142121 is about 586.8840041784.

Adding to 202142121 its reverse (121241202), we get a palindrome (323383323).

The spelling of 202142121 in words is "two hundred two million, one hundred forty-two thousand, one hundred twenty-one".