21814090 has 64 divisors (see below), whose sum is σ = 44323200. Its totient is φ = 7693056.

The previous prime is 21814087. The next prime is 21814123. The reversal of 21814090 is 9041812.

It is a happy number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 203817 + ... + 203923.

It is an arithmetic number, because the mean of its divisors is an integer number (692550).

Almost surely, 2^21814090 is an apocalyptic number.

21814090 is an abundant number, since it is smaller than the sum of its proper divisors (22509110).

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

21814090 is a wasteful number, since it uses less digits than its factorization.

21814090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199.

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 21814090 is about 4670.5556414628. Note that the first 3 decimals coincide. The cubic root of 21814090 is about 279.4124157673.

The spelling of 21814090 in words is "twenty-one million, eight hundred fourteen thousand, ninety".