21984992 has 12 divisors (see below), whose sum is σ = 43283016. Its totient is φ = 10992480.

The previous prime is 21984967. The next prime is 21985009. The reversal of 21984992 is 29948912.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343484 + ... + 343547.

It is an arithmetic number, because the mean of its divisors is an integer number (3606918).

Almost surely, 2^21984992 is an apocalyptic number.

It is an amenable number.

21984992 is a deficient number, since it is larger than the sum of its proper divisors (21298024).

21984992 is an equidigital number, since it uses as much as digits as its factorization.

21984992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 687041 (or 687033 counting only the distinct ones).

The product of its digits is 93312, while the sum is 44.

The square root of 21984992 is about 4688.8156287063. The cubic root of 21984992 is about 280.1402018951.

The spelling of 21984992 in words is "twenty-one million, nine hundred eighty-four thousand, nine hundred ninety-two".