21444432124 has 12 divisors (see below), whose sum is σ = 37641135448. Its totient is φ = 10689822000.

The previous prime is 21444432083. The next prime is 21444432127. The reversal of 21444432124 is 42123444412.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21444432127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8097027 + ... + 8099674.

Almost surely, 2^21444432124 is an apocalyptic number.

It is an amenable number.

21444432124 is a deficient number, since it is larger than the sum of its proper divisors (16196703324).

21444432124 is a wasteful number, since it uses less digits than its factorization.

21444432124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16197036 (or 16197034 counting only the distinct ones).

The product of its digits is 24576, while the sum is 31.

Adding to 21444432124 its reverse (42123444412), we get a palindrome (63567876536).

The spelling of 21444432124 in words is "twenty-one billion, four hundred forty-four million, four hundred thirty-two thousand, one hundred twenty-four".