21840814 has 16 divisors (see below), whose sum is σ = 33451200. Its totient is φ = 10692864.

The previous prime is 21840809. The next prime is 21840817. The reversal of 21840814 is 41804812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21840817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21142 + ... + 22150.

It is an arithmetic number, because the mean of its divisors is an integer number (2090700).

Almost surely, 2^21840814 is an apocalyptic number.

21840814 is a deficient number, since it is larger than the sum of its proper divisors (11610386).

21840814 is a wasteful number, since it uses less digits than its factorization.

21840814 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1227.

The product of its (nonzero) digits is 2048, while the sum is 28.

The square root of 21840814 is about 4673.4156673679. The cubic root of 21840814 is about 279.5264700359.

The spelling of 21840814 in words is "twenty-one million, eight hundred forty thousand, eight hundred fourteen".