12444455421 has 12 divisors (see below), whose sum is σ = 18461144572. Its totient is φ = 8072078976.

The previous prime is 12444455411. The next prime is 12444455453. The reversal of 12444455421 is 12455444421.

12444455421 is a `hidden beast` number, since 1 + 2 + 44 + 44 + 554 + 21 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 10855556100 + 1588899321 = 104190^2 + 39861^2 .

It is not a de Polignac number, because 12444455421 - 2⁷ = 12444455293 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12444455411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18685036 + ... + 18685701.

Almost surely, 2^12444455421 is an apocalyptic number.

It is an amenable number.

12444455421 is a deficient number, since it is larger than the sum of its proper divisors (6016689151).

12444455421 is a wasteful number, since it uses less digits than its factorization.

12444455421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37370780 (or 37370777 counting only the distinct ones).

The product of its digits is 102400, while the sum is 36.

Adding to 12444455421 its reverse (12455444421), we get a palindrome (24899899842).

The spelling of 12444455421 in words is "twelve billion, four hundred forty-four million, four hundred fifty-five thousand, four hundred twenty-one".