13323521 has 4 divisors (see below), whose sum is σ = 13753344. Its totient is φ = 12893700.

The previous prime is 13323517. The next prime is 13323523. The reversal of 13323521 is 12532331.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 13323521 - 2² = 13323517 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13323493 and 13323502.

It is not an unprimeable number, because it can be changed into a prime (13323523) 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, 214865 + ... + 214926.

It is an arithmetic number, because the mean of its divisors is an integer number (3438336).

Almost surely, 2^13323521 is an apocalyptic number.

It is an amenable number.

13323521 is a deficient number, since it is larger than the sum of its proper divisors (429823).

13323521 is an equidigital number, since it uses as much as digits as its factorization.

13323521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 429822.

The product of its digits is 540, while the sum is 20.

The square root of 13323521 is about 3650.1398603341. The cubic root of 13323521 is about 237.0680369863.

Adding to 13323521 its reverse (12532331), we get a palindrome (25855852).

The spelling of 13323521 in words is "thirteen million, three hundred twenty-three thousand, five hundred twenty-one".