21444430204 has 6 divisors (see below), whose sum is σ = 37527752864. Its totient is φ = 10722215100.

The previous prime is 21444430193. The next prime is 21444430261. The reversal of 21444430204 is 40203444412.

It is a congruent number.

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 as a sum of consecutive naturals, namely, 2680553772 + ... + 2680553779.

Almost surely, 2^21444430204 is an apocalyptic number.

It is an amenable number.

21444430204 is a deficient number, since it is larger than the sum of its proper divisors (16083322660).

21444430204 is a wasteful number, since it uses less digits than its factorization.

21444430204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5361107555 (or 5361107553 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 28.

Adding to 21444430204 its reverse (40203444412), we get a palindrome (61647874616).

The spelling of 21444430204 in words is "twenty-one billion, four hundred forty-four million, four hundred thirty thousand, two hundred four".