13044444221 has 4 divisors (see below), whose sum is σ = 13191011100. Its totient is φ = 12897877344.

The previous prime is 13044444211. The next prime is 13044444223. The reversal of 13044444221 is 12244444031.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12244444031 = 4073 ⋅3006247.

It can be written as a sum of positive squares in 2 ways, for example, as 1383468025 + 11660976196 = 37195^2 + 107986^2 .

It is a cyclic number.

It is not a de Polignac number, because 13044444221 - 2⁶ = 13044444157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13044444223) 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, 73283306 + ... + 73283483.

It is an arithmetic number, because the mean of its divisors is an integer number (3297752775).

Almost surely, 2^13044444221 is an apocalyptic number.

It is an amenable number.

13044444221 is a deficient number, since it is larger than the sum of its proper divisors (146566879).

13044444221 is an equidigital number, since it uses as much as digits as its factorization.

13044444221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146566878.

The product of its (nonzero) digits is 12288, while the sum is 29.

Adding to 13044444221 its reverse (12244444031), we get a palindrome (25288888252).

The spelling of 13044444221 in words is "thirteen billion, forty-four million, four hundred forty-four thousand, two hundred twenty-one".