21442444430 has 64 divisors (see below), whose sum is σ = 42636943296. Its totient is φ = 7699200000.

The previous prime is 21442444421. The next prime is 21442444447. The reversal of 21442444430 is 3444424412.

It is a Smith number, since the sum of its digits (32) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4452704 + ... + 4457516.

It is an arithmetic number, because the mean of its divisors is an integer number (666202239).

Almost surely, 2^21442444430 is an apocalyptic number.

21442444430 is a deficient number, since it is larger than the sum of its proper divisors (21194498866).

21442444430 is a wasteful number, since it uses less digits than its factorization.

21442444430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5333.

The product of its (nonzero) digits is 49152, while the sum is 32.

Adding to 21442444430 its reverse (3444424412), we get a palindrome (24886868842).

The spelling of 21442444430 in words is "twenty-one billion, four hundred forty-two million, four hundred forty-four thousand, four hundred thirty".