21707696 has 20 divisors (see below), whose sum is σ = 43085784. Its totient is φ = 10588800.

The previous prime is 21707603. The next prime is 21707701. The reversal of 21707696 is 69670712.

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, 15890 + ... + 17201.

Almost surely, 2^21707696 is an apocalyptic number.

It is an amenable number.

21707696 is a deficient number, since it is larger than the sum of its proper divisors (21378088).

21707696 is a wasteful number, since it uses less digits than its factorization.

21707696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33140 (or 33134 counting only the distinct ones).

The product of its (nonzero) digits is 31752, while the sum is 38.

The square root of 21707696 is about 4659.1518541468. The cubic root of 21707696 is about 278.9574152534.

The spelling of 21707696 in words is "twenty-one million, seven hundred seven thousand, six hundred ninety-six".