21204424204 has 24 divisors (see below), whose sum is σ = 38315547648. Its totient is φ = 10257317520.

The previous prime is 21204424193. The next prime is 21204424217. The reversal of 21204424204 is 40242440212.

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 7 ways as a sum of consecutive naturals, for example, 456879 + ... + 501145.

It is an arithmetic number, because the mean of its divisors is an integer number (1596481152).

Almost surely, 2^21204424204 is an apocalyptic number.

It is an amenable number.

21204424204 is a deficient number, since it is larger than the sum of its proper divisors (17111123444).

21204424204 is a wasteful number, since it uses less digits than its factorization.

21204424204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48165 (or 48163 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 25.

Adding to 21204424204 its reverse (40242440212), we get a palindrome (61446864416).

The spelling of 21204424204 in words is "twenty-one billion, two hundred four million, four hundred twenty-four thousand, two hundred four".