13204304521 has 2 divisors, whose sum is σ = 13204304522. Its totient is φ = 13204304520.

The previous prime is 13204304479. The next prime is 13204304527. The reversal of 13204304521 is 12540340231.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13189374025 + 14930496 = 114845^2 + 3864^2 .

It is an emirp because it is prime and its reverse (12540340231) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13204304521 - 2¹⁵ = 13204271753 is a prime.

It is not a weakly prime, because it can be changed into another prime (13204304527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6602152260 + 6602152261.

It is an arithmetic number, because the mean of its divisors is an integer number (6602152261).

Almost surely, 2^13204304521 is an apocalyptic number.

It is an amenable number.

13204304521 is a deficient number, since it is larger than the sum of its proper divisors (1).

13204304521 is an equidigital number, since it uses as much as digits as its factorization.

13204304521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2880, while the sum is 25.

Adding to 13204304521 its reverse (12540340231), we get a palindrome (25744644752).

The spelling of 13204304521 in words is "thirteen billion, two hundred four million, three hundred four thousand, five hundred twenty-one".