21044043432 has 64 divisors (see below), whose sum is σ = 59881449600. Its totient is φ = 6843588480.

The previous prime is 21044043413. The next prime is 21044043451. The reversal of 21044043432 is 23434044012.

It is a happy number.

21044043432 is a `hidden beast` number, since 210 + 4 + 404 + 3 + 43 + 2 = 666.

It is an interprime number because it is at equal distance from previous prime (21044043413) and next prime (21044043451).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 21044043396 and 21044043405.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 1179268 + ... + 1196979.

It is an arithmetic number, because the mean of its divisors is an integer number (935647650).

Almost surely, 2^21044043432 is an apocalyptic number.

It is an amenable number.

21044043432 is an abundant number, since it is smaller than the sum of its proper divisors (38837406168).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21044043432 is a wasteful number, since it uses less digits than its factorization.

21044043432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2376303 (or 2376293 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 27.

Adding to 21044043432 its reverse (23434044012), we get a palindrome (44478087444).

The spelling of 21044043432 in words is "twenty-one billion, forty-four million, forty-three thousand, four hundred thirty-two".