21707116 has 6 divisors (see below), whose sum is σ = 37987460. Its totient is φ = 10853556.

The previous prime is 21707089. The next prime is 21707117. The reversal of 21707116 is 61170712.

It is not an unprimeable number, because it can be changed into a prime (21707117) by changing a digit.

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 as a sum of consecutive naturals, namely, 2713386 + ... + 2713393.

Almost surely, 2^21707116 is an apocalyptic number.

It is an amenable number.

21707116 is a deficient number, since it is larger than the sum of its proper divisors (16280344).

21707116 is a wasteful number, since it uses less digits than its factorization.

21707116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5426783 (or 5426781 counting only the distinct ones).

The product of its (nonzero) digits is 588, while the sum is 25.

The square root of 21707116 is about 4659.0896106428. The cubic root of 21707116 is about 278.9549307775.

Adding to 21707116 its reverse (61170712), we get a palindrome (82877828).

The spelling of 21707116 in words is "twenty-one million, seven hundred seven thousand, one hundred sixteen".