202144131221 has 4 divisors (see below), whose sum is σ = 203933017452. Its totient is φ = 200355244992.

The previous prime is 202144131157. The next prime is 202144131229. The reversal of 202144131221 is 122131441202.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 122131441202 = 2 ⋅61065720601.

It can be written as a sum of positive squares in 2 ways, for example, as 14862048100 + 187282083121 = 121910^2 + 432761^2 .

It is a cyclic number.

It is not a de Polignac number, because 202144131221 - 2⁶ = 202144131157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202144131229) 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, 894442946 + ... + 894443171.

It is an arithmetic number, because the mean of its divisors is an integer number (50983254363).

Almost surely, 2^202144131221 is an apocalyptic number.

It is an amenable number.

202144131221 is a deficient number, since it is larger than the sum of its proper divisors (1788886231).

202144131221 is a wasteful number, since it uses less digits than its factorization.

202144131221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1788886230.

The product of its (nonzero) digits is 768, while the sum is 23.

Adding to 202144131221 its reverse (122131441202), we get a palindrome (324275572423).

The spelling of 202144131221 in words is "two hundred two billion, one hundred forty-four million, one hundred thirty-one thousand, two hundred twenty-one".