21804414 has 16 divisors (see below), whose sum is σ = 45505152. Its totient is φ = 6952088.

The previous prime is 21804361. The next prime is 21804449. The reversal of 21804414 is 41440812.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 78864 + ... + 79139.

It is an arithmetic number, because the mean of its divisors is an integer number (2844072).

Almost surely, 2^21804414 is an apocalyptic number.

21804414 is an abundant number, since it is smaller than the sum of its proper divisors (23700738).

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

21804414 is a wasteful number, since it uses less digits than its factorization.

21804414 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158031.

The product of its (nonzero) digits is 1024, while the sum is 24.

The square root of 21804414 is about 4669.5196755127. The cubic root of 21804414 is about 279.3710969932.

The spelling of 21804414 in words is "twenty-one million, eight hundred four thousand, four hundred fourteen".