21707108 has 12 divisors (see below), whose sum is σ = 38091900. Its totient is φ = 10823712.

The previous prime is 21707089. The next prime is 21707117. The reversal of 21707108 is 80170712.

It can be written as a sum of positive squares in 2 ways, for example, as 15194404 + 6512704 = 3898^2 + 2552^2 .

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, 5783 + ... + 8766.

It is an arithmetic number, because the mean of its divisors is an integer number (3174325).

Almost surely, 2^21707108 is an apocalyptic number.

It is an amenable number.

21707108 is a deficient number, since it is larger than the sum of its proper divisors (16384792).

21707108 is a wasteful number, since it uses less digits than its factorization.

21707108 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14926 (or 14924 counting only the distinct ones).

The product of its (nonzero) digits is 784, while the sum is 26.

The square root of 21707108 is about 4659.0887521059. The cubic root of 21707108 is about 278.9548965085.

The spelling of 21707108 in words is "twenty-one million, seven hundred seven thousand, one hundred eight".