21284714 has 16 divisors (see below), whose sum is σ = 36878976. Its totient is φ = 9105600.

The previous prime is 21284707. The next prime is 21284723. The reversal of 21284714 is 41748212.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28082 + ... + 28829.

It is an arithmetic number, because the mean of its divisors is an integer number (2304936).

Almost surely, 2^21284714 is an apocalyptic number.

21284714 is a deficient number, since it is larger than the sum of its proper divisors (15594262).

21284714 is a wasteful number, since it uses less digits than its factorization.

21284714 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56941.

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

The square root of 21284714 is about 4613.5359541246. The cubic root of 21284714 is about 277.1336572110.

The spelling of 21284714 in words is "twenty-one million, two hundred eighty-four thousand, seven hundred fourteen".