21984458 has 16 divisors (see below), whose sum is σ = 34577280. Its totient is φ = 10463376.

The previous prime is 21984449. The next prime is 21984467. The reversal of 21984458 is 85448912.

It is an interprime number because it is at equal distance from previous prime (21984449) and next prime (21984467).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9491 + ... + 11577.

It is an arithmetic number, because the mean of its divisors is an integer number (2161080).

Almost surely, 2^21984458 is an apocalyptic number.

21984458 is a deficient number, since it is larger than the sum of its proper divisors (12592822).

21984458 is a wasteful number, since it uses less digits than its factorization.

21984458 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2341.

The product of its digits is 92160, while the sum is 41.

The square root of 21984458 is about 4688.7586843428. The cubic root of 21984458 is about 280.1379337405.

The spelling of 21984458 in words is "twenty-one million, nine hundred eighty-four thousand, four hundred fifty-eight".