21144430204 has 12 divisors (see below), whose sum is σ = 39179385504. Its totient is φ = 9950320064.

The previous prime is 21144430157. The next prime is 21144430247. The reversal of 21144430204 is 40203444112.

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 3 ways as a sum of consecutive naturals, for example, 155473684 + ... + 155473819.

It is an arithmetic number, because the mean of its divisors is an integer number (3264948792).

Almost surely, 2^21144430204 is an apocalyptic number.

It is an amenable number.

21144430204 is a deficient number, since it is larger than the sum of its proper divisors (18034955300).

21144430204 is a wasteful number, since it uses less digits than its factorization.

21144430204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310947524 (or 310947522 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 25.

Adding to 21144430204 its reverse (40203444112), we get a palindrome (61347874316).

The spelling of 21144430204 in words is "twenty-one billion, one hundred forty-four million, four hundred thirty thousand, two hundred four".