21814318 has 8 divisors (see below), whose sum is σ = 34443720. Its totient is φ = 10333080.

The previous prime is 21814313. The next prime is 21814319. The reversal of 21814318 is 81341812.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21814313) 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 3 ways as a sum of consecutive naturals, for example, 286993 + ... + 287068.

It is an arithmetic number, because the mean of its divisors is an integer number (4305465).

Almost surely, 2^21814318 is an apocalyptic number.

21814318 is a deficient number, since it is larger than the sum of its proper divisors (12629402).

21814318 is a wasteful number, since it uses less digits than its factorization.

21814318 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 574082.

The product of its digits is 1536, while the sum is 28.

The square root of 21814318 is about 4670.5800496298. The cubic root of 21814318 is about 279.4133892331.

The spelling of 21814318 in words is "twenty-one million, eight hundred fourteen thousand, three hundred eighteen".