13508321 has 8 divisors (see below), whose sum is σ = 13880064. Its totient is φ = 13139280.

The previous prime is 13508303. The next prime is 13508323. The reversal of 13508321 is 12380531.

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 13508321 - 2¹⁴ = 13491937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13508323) 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, 13136 + ... + 14126.

It is an arithmetic number, because the mean of its divisors is an integer number (1735008).

Almost surely, 2^13508321 is an apocalyptic number.

It is an amenable number.

13508321 is a deficient number, since it is larger than the sum of its proper divisors (371743).

13508321 is an equidigital number, since it uses as much as digits as its factorization.

13508321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1351.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 13508321 is about 3675.3667844176. The cubic root of 13508321 is about 238.1590690962.

Adding to 13508321 its reverse (12380531), we get a palindrome (25888852).

The spelling of 13508321 in words is "thirteen million, five hundred eight thousand, three hundred twenty-one".