21814724 has 12 divisors (see below), whose sum is σ = 38636304. Its totient is φ = 10775784.

The previous prime is 21814711. The next prime is 21814733. The reversal of 21814724 is 42741812.

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, 32522 + ... + 33185.

It is an arithmetic number, because the mean of its divisors is an integer number (3219692).

Almost surely, 2^21814724 is an apocalyptic number.

It is an amenable number.

21814724 is a deficient number, since it is larger than the sum of its proper divisors (16821580).

21814724 is a wasteful number, since it uses less digits than its factorization.

21814724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65794 (or 65792 counting only the distinct ones).

The product of its digits is 3584, while the sum is 29.

The square root of 21814724 is about 4670.6235129798. The cubic root of 21814724 is about 279.4151226685.

The spelling of 21814724 in words is "twenty-one million, eight hundred fourteen thousand, seven hundred twenty-four".