21784470304 has 96 divisors (see below), whose sum is σ = 44855097840. Its totient is φ = 10405478400.

The previous prime is 21784470289. The next prime is 21784470317. The reversal of 21784470304 is 40307448712.

It can be written as a sum of positive squares in 8 ways, for example, as 511664400 + 21272805904 = 22620^2 + 145852^2 .

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 15 ways as a sum of consecutive naturals, for example, 23448912 + ... + 23449840.

Almost surely, 2^21784470304 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21784470304, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22427548920).

21784470304 is an abundant number, since it is smaller than the sum of its proper divisors (23070627536).

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

21784470304 is a wasteful number, since it uses less digits than its factorization.

21784470304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1334 (or 1326 counting only the distinct ones).

The product of its (nonzero) digits is 150528, while the sum is 40.

The spelling of 21784470304 in words is "twenty-one billion, seven hundred eighty-four million, four hundred seventy thousand, three hundred four".