211856 has 10 divisors (see below), whose sum is σ = 410502. Its totient is φ = 105920.

The previous prime is 211817. The next prime is 211859. The reversal of 211856 is 658112.

211856 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 211600 + 256 = 460^2 + 16^2 .

It is not an unprimeable number, because it can be changed into a prime (211859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6605 + ... + 6636.

2²¹¹⁸⁵⁶ is an apocalyptic number.

It is an amenable number.

211856 is a deficient number, since it is larger than the sum of its proper divisors (198646).

211856 is a wasteful number, since it uses less digits than its factorization.

211856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13249 (or 13243 counting only the distinct ones).

The product of its digits is 480, while the sum is 23.

The square root of 211856 is about 460.2781767584. The cubic root of 211856 is about 59.6138159944.

Adding to 211856 its reverse (658112), we get a palindrome (869968).

The spelling of 211856 in words is "two hundred eleven thousand, eight hundred fifty-six".