211285 has 4 divisors (see below), whose sum is σ = 253548. Its totient is φ = 169024.

The previous prime is 211283. The next prime is 211291. The reversal of 211285 is 582112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 93636 + 117649 = 306^2 + 343^2 .

It is a cyclic number.

It is not a de Polignac number, because 211285 - 2¹ = 211283 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211283) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21124 + ... + 21133.

It is an arithmetic number, because the mean of its divisors is an integer number (63387).

2²¹¹²⁸⁵ is an apocalyptic number.

It is an amenable number.

211285 is a deficient number, since it is larger than the sum of its proper divisors (42263).

211285 is an equidigital number, since it uses as much as digits as its factorization.

211285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42262.

The product of its digits is 160, while the sum is 19.

The square root of 211285 is about 459.6574811748. The cubic root of 211285 is about 59.5602102178.

Adding to 211285 its reverse (582112), we get a palindrome (793397).

It can be divided in two parts, 2112 and 85, that added together give a cube (2197 = 13³).

The spelling of 211285 in words is "two hundred eleven thousand, two hundred eighty-five".