211205 has 8 divisors (see below), whose sum is σ = 258552. Its totient is φ = 165568.

The previous prime is 211199. The next prime is 211213. The reversal of 211205 is 502112.

It can be written as a sum of positive squares in 4 ways, for example, as 36481 + 174724 = 191^2 + 418^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211205 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 134 + ... + 663.

It is an arithmetic number, because the mean of its divisors is an integer number (32319).

2²¹¹²⁰⁵ is an apocalyptic number.

It is an amenable number.

211205 is a deficient number, since it is larger than the sum of its proper divisors (47347).

211205 is an equidigital number, since it uses as much as digits as its factorization.

211205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 855.

The product of its (nonzero) digits is 20, while the sum is 11.

The square root of 211205 is about 459.5704516176. The cubic root of 211205 is about 59.5526920657.

Adding to 211205 its reverse (502112), we get a palindrome (713317).

The spelling of 211205 in words is "two hundred eleven thousand, two hundred five".