202142220121 has 4 divisors (see below), whose sum is σ = 203200556544. Its totient is φ = 201083883700.

The previous prime is 202142220101. The next prime is 202142220143. The reversal of 202142220121 is 121022241202.

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 202142220121 - 2³³ = 193552285529 is a prime.

It is a super-2 number, since 2×202142220121² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (202142220101) 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, 529167925 + ... + 529168306.

It is an arithmetic number, because the mean of its divisors is an integer number (50800139136).

Almost surely, 2^202142220121 is an apocalyptic number.

It is an amenable number.

202142220121 is a deficient number, since it is larger than the sum of its proper divisors (1058336423).

202142220121 is a wasteful number, since it uses less digits than its factorization.

202142220121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1058336422.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 202142220121 its reverse (121022241202), we get a palindrome (323164461323).

The spelling of 202142220121 in words is "two hundred two billion, one hundred forty-two million, two hundred twenty thousand, one hundred twenty-one".