13121321 has 4 divisors (see below), whose sum is σ = 13426512. Its totient is φ = 12816132.

The previous prime is 13121309. The next prime is 13121327. The reversal of 13121321 is 12312131.

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 13121321 - 2⁶ = 13121257 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13121296 and 13121305.

It is not an unprimeable number, because it can be changed into a prime (13121327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 152531 + ... + 152616.

It is an arithmetic number, because the mean of its divisors is an integer number (3356628).

Almost surely, 2^13121321 is an apocalyptic number.

It is an amenable number.

13121321 is a deficient number, since it is larger than the sum of its proper divisors (305191).

13121321 is an equidigital number, since it uses as much as digits as its factorization.

13121321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305190.

The product of its digits is 36, while the sum is 14.

The square root of 13121321 is about 3622.3364007226. The cubic root of 13121321 is about 235.8626570881.

Adding to 13121321 its reverse (12312131), we get a palindrome (25433452).

The spelling of 13121321 in words is "thirteen million, one hundred twenty-one thousand, three hundred twenty-one".