212866 has 4 divisors (see below), whose sum is σ = 319302. Its totient is φ = 106432.

The previous prime is 212851. The next prime is 212867. The reversal of 212866 is 668212.

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

It can be written as a sum of positive squares in only one way, i.e., 164025 + 48841 = 405^2 + 221^2 .

It is a nialpdrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 212866.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 53215 + ... + 53218.

2²¹²⁸⁶⁶ is an apocalyptic number.

212866 is a deficient number, since it is larger than the sum of its proper divisors (106436).

212866 is a wasteful number, since it uses less digits than its factorization.

212866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106435.

The product of its digits is 1152, while the sum is 25.

The square root of 212866 is about 461.3740348134. The cubic root of 212866 is about 59.7083999340.

The spelling of 212866 in words is "two hundred twelve thousand, eight hundred sixty-six".