13111321 has 4 divisors (see below), whose sum is σ = 13118644. Its totient is φ = 13104000.

The previous prime is 13111309. The next prime is 13111327. The reversal of 13111321 is 12311131.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 230400 + 12880921 = 480^2 + 3589^2 .

It is a cyclic number.

It is not a de Polignac number, because 13111321 - 2⁵ = 13111289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13111327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1021 + ... + 5221.

It is an arithmetic number, because the mean of its divisors is an integer number (3279661).

Almost surely, 2^13111321 is an apocalyptic number.

It is an amenable number.

13111321 is a deficient number, since it is larger than the sum of its proper divisors (7323).

13111321 is an equidigital number, since it uses as much as digits as its factorization.

13111321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7322.

The product of its digits is 18, while the sum is 13.

The square root of 13111321 is about 3620.9558130416. The cubic root of 13111321 is about 235.8027234374.

Adding to 13111321 its reverse (12311131), we get a palindrome (25422452).

The spelling of 13111321 in words is "thirteen million, one hundred eleven thousand, three hundred twenty-one".