21648304 has 10 divisors (see below), whose sum is σ = 41943620. Its totient is φ = 10824144.

The previous prime is 21648301. The next prime is 21648311. The reversal of 21648304 is 40384612.

It is not an unprimeable number, because it can be changed into a prime (21648301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 676494 + ... + 676525.

It is an arithmetic number, because the mean of its divisors is an integer number (4194362).

Almost surely, 2^21648304 is an apocalyptic number.

It is an amenable number.

21648304 is a deficient number, since it is larger than the sum of its proper divisors (20295316).

21648304 is a wasteful number, since it uses less digits than its factorization.

21648304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1353027 (or 1353021 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 28.

The square root of 21648304 is about 4652.7737963499. The cubic root of 21648304 is about 278.7027748159.

It can be divided in two parts, 21648 and 304, that added together give a cube (21952 = 28³).

The spelling of 21648304 in words is "twenty-one million, six hundred forty-eight thousand, three hundred four".