13221116444 has 24 divisors (see below), whose sum is σ = 24503462928. Its totient is φ = 6220302080.

The previous prime is 13221116423. The next prime is 13221116459. The reversal of 13221116444 is 44461112231.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 322067 + ... + 360789.

It is an arithmetic number, because the mean of its divisors is an integer number (1020977622).

Almost surely, 2^13221116444 is an apocalyptic number.

It is an amenable number.

13221116444 is a deficient number, since it is larger than the sum of its proper divisors (11282346484).

13221116444 is a wasteful number, since it uses less digits than its factorization.

13221116444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43765 (or 43763 counting only the distinct ones).

The product of its digits is 4608, while the sum is 29.

Adding to 13221116444 its reverse (44461112231), we get a palindrome (57682228675).

The spelling of 13221116444 in words is "thirteen billion, two hundred twenty-one million, one hundred sixteen thousand, four hundred forty-four".