21823704 has 192 divisors, whose sum is σ = 74131200. Its totient is φ = 5660928.

The previous prime is 21823693. The next prime is 21823717. The reversal of 21823704 is 40732812.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 411742 + ... + 411794.

It is an arithmetic number, because the mean of its divisors is an integer number (386100).

Almost surely, 2^21823704 is an apocalyptic number.

21823704 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21823704, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37065600).

21823704 is an abundant number, since it is smaller than the sum of its proper divisors (52307496).

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

21823704 is a wasteful number, since it uses less digits than its factorization.

21823704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134 (or 127 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 21823704 is about 4671.5847418194. The cubic root of 21823704 is about 279.4534576876.

It can be divided in two parts, 2182 and 3704, that added together give a triangular number (5886 = T₁₀₈).

The spelling of 21823704 in words is "twenty-one million, eight hundred twenty-three thousand, seven hundred four".