13444213321 has 24 divisors (see below), whose sum is σ = 16913437632. Its totient is φ = 10460604000.

The previous prime is 13444213319. The next prime is 13444213351. The reversal of 13444213321 is 12331244431.

It is a happy number.

It is not a de Polignac number, because 13444213321 - 2¹ = 13444213319 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13444213321.

It is not an unprimeable number, because it can be changed into a prime (13444213351) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 582426 + ... + 605068.

It is an arithmetic number, because the mean of its divisors is an integer number (704726568).

Almost surely, 2^13444213321 is an apocalyptic number.

13444213321 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

13444213321 is a deficient number, since it is larger than the sum of its proper divisors (3469224311).

13444213321 is a wasteful number, since it uses less digits than its factorization.

13444213321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23373 (or 23362 counting only the distinct ones).

The product of its digits is 6912, while the sum is 28.

Adding to 13444213321 its reverse (12331244431), we get a palindrome (25775457752).

The spelling of 13444213321 in words is "thirteen billion, four hundred forty-four million, two hundred thirteen thousand, three hundred twenty-one".