21834816 has 28 divisors (see below), whose sum is σ = 57771792. Its totient is φ = 7278208.

The previous prime is 21834803. The next prime is 21834821. The reversal of 21834816 is 61843812.

It is a nude number because it is divisible by every one of its digits.

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, 56670 + ... + 57053.

Almost surely, 2^21834816 is an apocalyptic number.

It is an amenable number.

21834816 is an abundant number, since it is smaller than the sum of its proper divisors (35936976).

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

21834816 is a wasteful number, since it uses less digits than its factorization.

21834816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113738 (or 113728 counting only the distinct ones).

The product of its digits is 9216, while the sum is 33.

The square root of 21834816 is about 4672.7739085045. The cubic root of 21834816 is about 279.5008795174.

The spelling of 21834816 in words is "twenty-one million, eight hundred thirty-four thousand, eight hundred sixteen".