21384704 has 40 divisors (see below), whose sum is σ = 46624248. Its totient is φ = 9717760.

The previous prime is 21384679. The next prime is 21384719. The reversal of 21384704 is 40748312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3734 + ... + 7530.

Almost surely, 2^21384704 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21384704, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23312124).

21384704 is an abundant number, since it is smaller than the sum of its proper divisors (25239544).

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

21384704 is an equidigital number, since it uses as much as digits as its factorization.

21384704 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3826 (or 3810 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 29.

The square root of 21384704 is about 4624.3598475897. The cubic root of 21384704 is about 277.5669464863.

The spelling of 21384704 in words is "twenty-one million, three hundred eighty-four thousand, seven hundred four".