13443344421 has 64 divisors (see below), whose sum is σ = 20183654400. Its totient is φ = 7905081600.

The previous prime is 13443344413. The next prime is 13443344423. The reversal of 13443344421 is 12444334431.

It is not a de Polignac number, because 13443344421 - 2³ = 13443344413 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13443344423) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 22442680 + ... + 22443278.

It is an arithmetic number, because the mean of its divisors is an integer number (315369600).

Almost surely, 2^13443344421 is an apocalyptic number.

It is an amenable number.

13443344421 is a deficient number, since it is larger than the sum of its proper divisors (6740309979).

13443344421 is a wasteful number, since it uses less digits than its factorization.

13443344421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 906.

The product of its digits is 55296, while the sum is 33.

Adding to 13443344421 its reverse (12444334431), we get a palindrome (25887678852).

The spelling of 13443344421 in words is "thirteen billion, four hundred forty-three million, three hundred forty-four thousand, four hundred twenty-one".