13444464321 has 20 divisors (see below), whose sum is σ = 20956913472. Its totient is φ = 8573280408.

The previous prime is 13444464289. The next prime is 13444464373. The reversal of 13444464321 is 12346444431.

13444464321 is a `hidden beast` number, since 1 + 3 + 4 + 4 + 4 + 4 + 643 + 2 + 1 = 666.

It is not a de Polignac number, because 13444464321 - 2⁵ = 13444464289 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13444464421) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 3606421 + ... + 3610146.

Almost surely, 2^13444464321 is an apocalyptic number.

It is an amenable number.

13444464321 is a deficient number, since it is larger than the sum of its proper divisors (7512449151).

13444464321 is an equidigital number, since it uses as much as digits as its factorization.

13444464321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7216602 (or 7216593 counting only the distinct ones).

The product of its digits is 110592, while the sum is 36.

It can be divided in two parts, 134444 and 64321, that added together give a triangular number (198765 = T₆₃₀).

The spelling of 13444464321 in words is "thirteen billion, four hundred forty-four million, four hundred sixty-four thousand, three hundred twenty-one".