13553321 has 4 divisors (see below), whose sum is σ = 13570500. Its totient is φ = 13536144.

The previous prime is 13553311. The next prime is 13553341. The reversal of 13553321 is 12335531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12335531 = 13 ⋅948887.

It can be written as a sum of positive squares in 2 ways, for example, as 4791721 + 8761600 = 2189^2 + 2960^2 .

It is a cyclic number.

It is not a de Polignac number, because 13553321 - 2⁶ = 13553257 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (13553311) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7346 + ... + 9003.

It is an arithmetic number, because the mean of its divisors is an integer number (3392625).

Almost surely, 2^13553321 is an apocalyptic number.

It is an amenable number.

13553321 is a deficient number, since it is larger than the sum of its proper divisors (17179).

13553321 is an equidigital number, since it uses as much as digits as its factorization.

13553321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17178.

The product of its digits is 1350, while the sum is 23.

The square root of 13553321 is about 3681.4835324907. The cubic root of 13553321 is about 238.4232341607.

Adding to 13553321 its reverse (12335531), we get a palindrome (25888852).

The spelling of 13553321 in words is "thirteen million, five hundred fifty-three thousand, three hundred twenty-one".