212287 has 4 divisors (see below), whose sum is σ = 223480. Its totient is φ = 201096.

The previous prime is 212281. The next prime is 212293. The reversal of 212287 is 782212.

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

It is an interprime number because it is at equal distance from previous prime (212281) and next prime (212293).

It is not a de Polignac number, because 212287 - 2¹⁵ = 179519 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 pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5568 + ... + 5605.

It is an arithmetic number, because the mean of its divisors is an integer number (55870).

2²¹²²⁸⁷ is an apocalyptic number.

212287 is a deficient number, since it is larger than the sum of its proper divisors (11193).

212287 is a wasteful number, since it uses less digits than its factorization.

212287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11192.

The product of its digits is 448, while the sum is 22.

The square root of 212287 is about 460.7461340044. The cubic root of 212287 is about 59.6542147412.

Adding to 212287 its reverse (782212), we get a palindrome (994499).

It can be divided in two parts, 2122 and 87, that added together give a square (2209 = 47²).

The spelling of 212287 in words is "two hundred twelve thousand, two hundred eighty-seven".