211986830 has 32 divisors (see below), whose sum is σ = 422143488. Its totient is φ = 75997600.

The previous prime is 211986829. The next prime is 211986869. The reversal of 211986830 is 38689112.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 5762 + ... + 21381.

It is an arithmetic number, because the mean of its divisors is an integer number (13191984).

Almost surely, 2^211986830 is an apocalyptic number.

211986830 is a deficient number, since it is larger than the sum of its proper divisors (210156658).

211986830 is a wasteful number, since it uses less digits than its factorization.

211986830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27232.

The product of its (nonzero) digits is 20736, while the sum is 38.

The square root of 211986830 is about 14559.7675118801. The cubic root of 211986830 is about 596.2608481633.

The spelling of 211986830 in words is "two hundred eleven million, nine hundred eighty-six thousand, eight hundred thirty".