21104984 has 24 divisors (see below), whose sum is σ = 41375460. Its totient is φ = 10091664.

The previous prime is 21104981. The next prime is 21104989. The reversal of 21104984 is 48940112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21104981) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1739 + ... + 6725.

Almost surely, 2^21104984 is an apocalyptic number.

It is an amenable number.

21104984 is a deficient number, since it is larger than the sum of its proper divisors (20270476).

21104984 is a wasteful number, since it uses less digits than its factorization.

21104984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5039 (or 5012 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 21104984 is about 4594.0161079387. The cubic root of 21104984 is about 276.3514042527.

The spelling of 21104984 in words is "twenty-one million, one hundred four thousand, nine hundred eighty-four".