21984168 has 32 divisors (see below), whose sum is σ = 55107360. Its totient is φ = 7308480.

The previous prime is 21984163. The next prime is 21984173. The reversal of 21984168 is 86148912.

It is an interprime number because it is at equal distance from previous prime (21984163) and next prime (21984173).

It is not an unprimeable number, because it can be changed into a prime (21984161) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10071 + ... + 12057.

It is an arithmetic number, because the mean of its divisors is an integer number (1722105).

Almost surely, 2^21984168 is an apocalyptic number.

It is an amenable number.

21984168 is an abundant number, since it is smaller than the sum of its proper divisors (33123192).

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

21984168 is a wasteful number, since it uses less digits than its factorization.

21984168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2457 (or 2453 counting only the distinct ones).

The product of its digits is 27648, while the sum is 39.

The square root of 21984168 is about 4688.7277592114. The cubic root of 21984168 is about 280.1367019558.

The spelling of 21984168 in words is "twenty-one million, nine hundred eighty-four thousand, one hundred sixty-eight".