21043028304 has 30 divisors (see below), whose sum is σ = 58891253226. Its totient is φ = 7014342720.

The previous prime is 21043028269. The next prime is 21043028311. The reversal of 21043028304 is 40382034012.

It can be written as a sum of positive squares in only one way, i.e., 15545102400 + 5497925904 = 124680^2 + 74148^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 73065927 + ... + 73066214.

Almost surely, 2^21043028304 is an apocalyptic number.

21043028304 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21043028304 is an abundant number, since it is smaller than the sum of its proper divisors (37848224922).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21043028304 is a wasteful number, since it uses less digits than its factorization.

21043028304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146132155 (or 146132146 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

The spelling of 21043028304 in words is "twenty-one billion, forty-three million, twenty-eight thousand, three hundred four".