21116708 has 6 divisors (see below), whose sum is σ = 36954246. Its totient is φ = 10558352.

The previous prime is 21116707. The next prime is 21116713. The reversal of 21116708 is 80761112.

It can be written as a sum of positive squares in only one way, i.e., 19695844 + 1420864 = 4438^2 + 1192^2 .

It is not an unprimeable number, because it can be changed into a prime (21116701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2639585 + ... + 2639592.

It is an arithmetic number, because the mean of its divisors is an integer number (6159041).

Almost surely, 2^21116708 is an apocalyptic number.

It is an amenable number.

21116708 is a deficient number, since it is larger than the sum of its proper divisors (15837538).

21116708 is a wasteful number, since it uses less digits than its factorization.

21116708 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5279181 (or 5279179 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 26.

The square root of 21116708 is about 4595.2919384953. The cubic root of 21116708 is about 276.4025666402.

The spelling of 21116708 in words is "twenty-one million, one hundred sixteen thousand, seven hundred eight".