13344443521 has 4 divisors (see below), whose sum is σ = 13356927700. Its totient is φ = 13331959344.

The previous prime is 13344443513. The next prime is 13344443537. The reversal of 13344443521 is 12534444331.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12534444331 = 59 ⋅212448209.

It can be written as a sum of positive squares in 2 ways, for example, as 6789760000 + 6554683521 = 82400^2 + 80961^2 .

It is a cyclic number.

It is not a de Polignac number, because 13344443521 - 2³ = 13344443513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13344443591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6240486 + ... + 6242623.

It is an arithmetic number, because the mean of its divisors is an integer number (3339231925).

Almost surely, 2^13344443521 is an apocalyptic number.

It is an amenable number.

13344443521 is a deficient number, since it is larger than the sum of its proper divisors (12484179).

13344443521 is a wasteful number, since it uses less digits than its factorization.

13344443521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12484178.

The product of its digits is 69120, while the sum is 34.

Adding to 13344443521 its reverse (12534444331), we get a palindrome (25878887852).

The spelling of 13344443521 in words is "thirteen billion, three hundred forty-four million, four hundred forty-three thousand, five hundred twenty-one".