13044431321 has 4 divisors (see below), whose sum is σ = 13044995892. Its totient is φ = 13043866752.

The previous prime is 13044431273. The next prime is 13044431329. The reversal of 13044431321 is 12313444031.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9611057296 + 3433374025 = 98036^2 + 58595^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13044431321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13044431329) 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, 246080 + ... + 294353.

It is an arithmetic number, because the mean of its divisors is an integer number (3261248973).

Almost surely, 2^13044431321 is an apocalyptic number.

It is an amenable number.

13044431321 is a deficient number, since it is larger than the sum of its proper divisors (564571).

13044431321 is an equidigital number, since it uses as much as digits as its factorization.

13044431321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 564570.

The product of its (nonzero) digits is 3456, while the sum is 26.

Adding to 13044431321 its reverse (12313444031), we get a palindrome (25357875352).

The spelling of 13044431321 in words is "thirteen billion, forty-four million, four hundred thirty-one thousand, three hundred twenty-one".