211678930 has 16 divisors (see below), whose sum is σ = 383765760. Its totient is φ = 84061872.

The previous prime is 211678919. The next prime is 211678937. The reversal of 211678930 is 39876112.

It is a self number, because there is not a number n which added to its sum of digits gives 211678930.

It is not an unprimeable number, because it can be changed into a prime (211678937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 74754 + ... + 77533.

It is an arithmetic number, because the mean of its divisors is an integer number (23985360).

Almost surely, 2^211678930 is an apocalyptic number.

211678930 is a deficient number, since it is larger than the sum of its proper divisors (172086830).

211678930 is a wasteful number, since it uses less digits than its factorization.

211678930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152433.

The product of its (nonzero) digits is 18144, while the sum is 37.

The square root of 211678930 is about 14549.1900118185. The cubic root of 211678930 is about 595.9720288511.

The spelling of 211678930 in words is "two hundred eleven million, six hundred seventy-eight thousand, nine hundred thirty".