21814456 has 16 divisors (see below), whose sum is σ = 40958640. Its totient is φ = 10892160.

The previous prime is 21814447. The next prime is 21814487. The reversal of 21814456 is 65441812.

It is a congruent 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 3 ways as a sum of consecutive naturals, for example, 6421 + ... + 9211.

It is an arithmetic number, because the mean of its divisors is an integer number (2559915).

Almost surely, 2^21814456 is an apocalyptic number.

It is an amenable number.

21814456 is a deficient number, since it is larger than the sum of its proper divisors (19144184).

21814456 is a wasteful number, since it uses less digits than its factorization.

21814456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3774 (or 3770 counting only the distinct ones).

The product of its digits is 7680, while the sum is 31.

The square root of 21814456 is about 4670.5948229321. The cubic root of 21814456 is about 279.4139784327.

The spelling of 21814456 in words is "twenty-one million, eight hundred fourteen thousand, four hundred fifty-six".