12444544221 has 16 divisors (see below), whose sum is σ = 18043602624. Its totient is φ = 7597304064.

The previous prime is 12444544163. The next prime is 12444544237. The reversal of 12444544221 is 12244544421.

It is not a de Polignac number, because 12444544221 - 2¹⁸ = 12444282077 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12444544291) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3295555 + ... + 3299328.

It is an arithmetic number, because the mean of its divisors is an integer number (1127725164).

Almost surely, 2^12444544221 is an apocalyptic number.

It is an amenable number.

12444544221 is a deficient number, since it is larger than the sum of its proper divisors (5599058403).

12444544221 is a wasteful number, since it uses less digits than its factorization.

12444544221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6594940.

The product of its digits is 40960, while the sum is 33.

The spelling of 12444544221 in words is "twelve billion, four hundred forty-four million, five hundred forty-four thousand, two hundred twenty-one".