211800930 has 32 divisors (see below), whose sum is σ = 554534208. Its totient is φ = 51345600.

The previous prime is 211800917. The next prime is 211800947. The reversal of 211800930 is 39008112.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 211800930.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 320581 + ... + 321240.

It is an arithmetic number, because the mean of its divisors is an integer number (17329194).

Almost surely, 2^211800930 is an apocalyptic number.

211800930 is an abundant number, since it is smaller than the sum of its proper divisors (342733278).

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

211800930 is a wasteful number, since it uses less digits than its factorization.

211800930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 641842.

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 211800930 is about 14553.3820811521. The cubic root of 211800930 is about 596.0865019411.

The spelling of 211800930 in words is "two hundred eleven million, eight hundred thousand, nine hundred thirty".