21703684 has 12 divisors (see below), whose sum is σ = 38318364. Its totient is φ = 10755584.

The previous prime is 21703667. The next prime is 21703699. The reversal of 21703684 is 48630712.

It can be written as a sum of positive squares in 2 ways, for example, as 1633284 + 20070400 = 1278^2 + 4480^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23557 + ... + 24460.

It is an arithmetic number, because the mean of its divisors is an integer number (3193197).

Almost surely, 2^21703684 is an apocalyptic number.

It is an amenable number.

21703684 is a deficient number, since it is larger than the sum of its proper divisors (16614680).

21703684 is a wasteful number, since it uses less digits than its factorization.

21703684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48134 (or 48132 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 21703684 is about 4658.7212837859. The cubic root of 21703684 is about 278.9402286282.

The spelling of 21703684 in words is "twenty-one million, seven hundred three thousand, six hundred eighty-four".