13221523 has 12 divisors (see below), whose sum is σ = 15710112. Its totient is φ = 11089680.

The previous prime is 13221503. The next prime is 13221553. The reversal of 13221523 is 32512231.

It is not a de Polignac number, because 13221523 - 2⁵ = 13221491 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13221523.

It is not an unprimeable number, because it can be changed into a prime (13221503) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 568 + ... + 5173.

It is an arithmetic number, because the mean of its divisors is an integer number (1309176).

Almost surely, 2^13221523 is an apocalyptic number.

13221523 is a deficient number, since it is larger than the sum of its proper divisors (2488589).

13221523 is an equidigital number, since it uses as much as digits as its factorization.

13221523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5802 (or 5795 counting only the distinct ones).

The product of its digits is 360, while the sum is 19.

The square root of 13221523 is about 3636.1412238801. The cubic root of 13221523 is about 236.4615297974.

Adding to 13221523 its reverse (32512231), we get a palindrome (45733754).

The spelling of 13221523 in words is "thirteen million, two hundred twenty-one thousand, five hundred twenty-three".