13531323321 has 8 divisors (see below), whose sum is σ = 20046404960. Its totient is φ = 9020882196.

The previous prime is 13531323307. The next prime is 13531323341. The reversal of 13531323321 is 12332313531.

13531323321 is a `hidden beast` number, since 1 + 3 + 5 + 313 + 23 + 321 = 666.

It is not a de Polignac number, because 13531323321 - 2¹⁰ = 13531322297 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 501160123 = 13531323321 / (1 + 3 + 5 + 3 + 1 + 3 + 2 + 3 + 3 + 2 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13531323341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 250580035 + ... + 250580088.

It is an arithmetic number, because the mean of its divisors is an integer number (2505800620).

Almost surely, 2^13531323321 is an apocalyptic number.

It is an amenable number.

13531323321 is a deficient number, since it is larger than the sum of its proper divisors (6515081639).

13531323321 is an equidigital number, since it uses as much as digits as its factorization.

13531323321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 501160132 (or 501160126 counting only the distinct ones).

The product of its digits is 4860, while the sum is 27.

Adding to 13531323321 its reverse (12332313531), we get a palindrome (25863636852).

The spelling of 13531323321 in words is "thirteen billion, five hundred thirty-one million, three hundred twenty-three thousand, three hundred twenty-one".