202131321 has 12 divisors (see below), whose sum is σ = 313510032. Its totient is φ = 115503528.

The previous prime is 202131313. The next prime is 202131361. The reversal of 202131321 is 123131202.

It is not a de Polignac number, because 202131321 - 2³ = 202131313 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 202131321.

It is not an unprimeable number, because it can be changed into a prime (202131361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 687375 + ... + 687668.

It is an arithmetic number, because the mean of its divisors is an integer number (26125836).

Almost surely, 2^202131321 is an apocalyptic number.

202131321 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

202131321 is a deficient number, since it is larger than the sum of its proper divisors (111378711).

202131321 is a wasteful number, since it uses less digits than its factorization.

202131321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1375060 (or 1375053 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 202131321 is about 14217.2895096077. The cubic root of 202131321 is about 586.8735520271.

Adding to 202131321 its reverse (123131202), we get a palindrome (325262523).

The spelling of 202131321 in words is "two hundred two million, one hundred thirty-one thousand, three hundred twenty-one".