210668986 has 12 divisors (see below), whose sum is σ = 347343066. Its totient is φ = 95758520.

The previous prime is 210668893. The next prime is 210669013. The reversal of 210668986 is 689866012.

It can be written as a sum of positive squares in only one way, i.e., 137241225 + 73427761 = 11715^2 + 8569^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 435025 + ... + 435508.

Almost surely, 2^210668986 is an apocalyptic number.

210668986 is a deficient number, since it is larger than the sum of its proper divisors (136674080).

210668986 is a wasteful number, since it uses less digits than its factorization.

210668986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 870557 (or 870546 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 46.

The square root of 210668986 is about 14514.4406023794. The cubic root of 210668986 is about 595.0227009205.

The spelling of 210668986 in words is "two hundred ten million, six hundred sixty-eight thousand, nine hundred eighty-six".