13231232521 has 8 divisors (see below), whose sum is σ = 14998968320. Its totient is φ = 11570632272.

The previous prime is 13231232503. The next prime is 13231232533. The reversal of 13231232521 is 12523213231.

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

It is a cyclic number.

It is not a de Polignac number, because 13231232521 - 2⁷ = 13231232393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13231232501) 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 7 ways as a sum of consecutive naturals, for example, 26783625 + ... + 26784118.

It is an arithmetic number, because the mean of its divisors is an integer number (1874871040).

Almost surely, 2^13231232521 is an apocalyptic number.

It is an amenable number.

13231232521 is a deficient number, since it is larger than the sum of its proper divisors (1767735799).

13231232521 is a wasteful number, since it uses less digits than its factorization.

13231232521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53567775.

The product of its digits is 2160, while the sum is 25.

Adding to 13231232521 its reverse (12523213231), we get a palindrome (25754445752).

The spelling of 13231232521 in words is "thirteen billion, two hundred thirty-one million, two hundred thirty-two thousand, five hundred twenty-one".