202131042521 has 8 divisors (see below), whose sum is σ = 209109232200. Its totient is φ = 195153396480.

The previous prime is 202131042473. The next prime is 202131042539. The reversal of 202131042521 is 125240131202.

It can be written as a sum of positive squares in 4 ways, for example, as 69171630025 + 132959412496 = 263005^2 + 364636^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-202131042521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (202131042571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 709841 + ... + 952961.

It is an arithmetic number, because the mean of its divisors is an integer number (26138654025).

Almost surely, 2^202131042521 is an apocalyptic number.

It is an amenable number.

202131042521 is a deficient number, since it is larger than the sum of its proper divisors (6978189679).

202131042521 is a wasteful number, since it uses less digits than its factorization.

202131042521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271819.

The product of its (nonzero) digits is 960, while the sum is 23.

Adding to 202131042521 its reverse (125240131202), we get a palindrome (327371173723).

The spelling of 202131042521 in words is "two hundred two billion, one hundred thirty-one million, forty-two thousand, five hundred twenty-one".