21716008 has 16 divisors (see below), whose sum is σ = 41486580. Its totient is φ = 10652928.

The previous prime is 21715999. The next prime is 21716017. The reversal of 21716008 is 80061712.

It is an interprime number because it is at equal distance from previous prime (21715999) and next prime (21716017).

It can be written as a sum of positive squares in 2 ways, for example, as 21696964 + 19044 = 4658^2 + 138^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25185 + ... + 26032.

Almost surely, 2^21716008 is an apocalyptic number.

It is an amenable number.

21716008 is a deficient number, since it is larger than the sum of its proper divisors (19770572).

21716008 is a wasteful number, since it uses less digits than its factorization.

21716008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51276 (or 51272 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 25.

The square root of 21716008 is about 4660.0437766184. The cubic root of 21716008 is about 278.9930155024.

The spelling of 21716008 in words is "twenty-one million, seven hundred sixteen thousand, eight".