13043444321 has 2 divisors, whose sum is σ = 13043444322. Its totient is φ = 13043444320.

The previous prime is 13043444317. The next prime is 13043444341. The reversal of 13043444321 is 12344434031.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12763350625 + 280093696 = 112975^2 + 16736^2 .

It is a cyclic number.

It is not a de Polignac number, because 13043444321 - 2² = 13043444317 is a prime.

It is a super-3 number, since 3×13043444321³ (a number of 31 digits) contains 333 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (13043444341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6521722160 + 6521722161.

It is an arithmetic number, because the mean of its divisors is an integer number (6521722161).

Almost surely, 2^13043444321 is an apocalyptic number.

It is an amenable number.

13043444321 is a deficient number, since it is larger than the sum of its proper divisors (1).

13043444321 is an equidigital number, since it uses as much as digits as its factorization.

13043444321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13824, while the sum is 29.

Adding to 13043444321 its reverse (12344434031), we get a palindrome (25387878352).

The spelling of 13043444321 in words is "thirteen billion, forty-three million, four hundred forty-four thousand, three hundred twenty-one".