21818314 has 16 divisors (see below), whose sum is σ = 38316096. Its totient is φ = 9122400.

The previous prime is 21818311. The next prime is 21818339. The reversal of 21818314 is 41381812.

It is not an unprimeable number, because it can be changed into a prime (21818311) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18432 + ... + 19579.

It is an arithmetic number, because the mean of its divisors is an integer number (2394756).

Almost surely, 2^21818314 is an apocalyptic number.

21818314 is a deficient number, since it is larger than the sum of its proper divisors (16497782).

21818314 is a wasteful number, since it uses less digits than its factorization.

21818314 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38061.

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

The square root of 21818314 is about 4671.0078141660. The cubic root of 21818314 is about 279.4304494002.

The spelling of 21818314 in words is "twenty-one million, eight hundred eighteen thousand, three hundred fourteen".