21204133024 has 12 divisors (see below), whose sum is σ = 41745636954. Its totient is φ = 10602066496.

The previous prime is 21204133003. The next prime is 21204133033. The reversal of 21204133024 is 42033140212.

It can be written as a sum of positive squares in only one way, i.e., 12530563600 + 8673569424 = 111940^2 + 93132^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21204132986 and 21204133004.

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 as a sum of consecutive naturals, namely, 331314547 + ... + 331314610.

Almost surely, 2^21204133024 is an apocalyptic number.

It is an amenable number.

21204133024 is a deficient number, since it is larger than the sum of its proper divisors (20541503930).

21204133024 is an equidigital number, since it uses as much as digits as its factorization.

21204133024 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 662629167 (or 662629159 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

Adding to 21204133024 its reverse (42033140212), we get a palindrome (63237273236).

The spelling of 21204133024 in words is "twenty-one billion, two hundred four million, one hundred thirty-three thousand, twenty-four".