21984384 has 32 divisors (see below), whose sum is σ = 58397040. Its totient is φ = 7328000.

The previous prime is 21984359. The next prime is 21984397. The reversal of 21984384 is 48348912.

It is a tau number, because it is divible by the number of its divisors (32).

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 28242 + ... + 29009.

Almost surely, 2^21984384 is an apocalyptic number.

21984384 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21984384 is an abundant number, since it is smaller than the sum of its proper divisors (36412656).

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

21984384 is an equidigital number, since it uses as much as digits as its factorization.

21984384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57268 (or 57256 counting only the distinct ones).

The product of its digits is 55296, while the sum is 39.

The square root of 21984384 is about 4688.7507931218. The cubic root of 21984384 is about 280.1376194241.

The spelling of 21984384 in words is "twenty-one million, nine hundred eighty-four thousand, three hundred eighty-four".