211338666 has 192 divisors, whose sum is σ = 611660160. Its totient is φ = 53464320.

The previous prime is 211338637. The next prime is 211338727. The reversal of 211338666 is 666833112.

It is a self number, because there is not a number n which added to its sum of digits gives 211338666.

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 95 ways as a sum of consecutive naturals, for example, 1542550 + ... + 1542686.

It is an arithmetic number, because the mean of its divisors is an integer number (3185730).

Almost surely, 2^211338666 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 211338666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (305830080).

211338666 is an abundant number, since it is smaller than the sum of its proper divisors (400321494).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

211338666 is a wasteful number, since it uses less digits than its factorization.

211338666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226 (or 213 counting only the distinct ones).

The product of its digits is 31104, while the sum is 36.

The square root of 211338666 is about 14537.4917368850. The cubic root of 211338666 is about 595.6525251876.

The spelling of 211338666 in words is "two hundred eleven million, three hundred thirty-eight thousand, six hundred sixty-six".