212285 has 4 divisors (see below), whose sum is σ = 254748. Its totient is φ = 169824.

The previous prime is 212281. The next prime is 212293. The reversal of 212285 is 582212.

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 143641 + 68644 = 379^2 + 262^2 .

It is a cyclic number.

It is not a de Polignac number, because 212285 - 2² = 212281 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 (212281) 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, 21224 + ... + 21233.

It is an arithmetic number, because the mean of its divisors is an integer number (63687).

2²¹²²⁸⁵ is an apocalyptic number.

It is an amenable number.

212285 is a deficient number, since it is larger than the sum of its proper divisors (42463).

212285 is an equidigital number, since it uses as much as digits as its factorization.

212285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42462.

The product of its digits is 320, while the sum is 20.

The square root of 212285 is about 460.7439636067. The cubic root of 212285 is about 59.6540274023.

Adding to 212285 its reverse (582212), we get a palindrome (794497).

The spelling of 212285 in words is "two hundred twelve thousand, two hundred eighty-five".