212684 has 6 divisors (see below), whose sum is σ = 372204. Its totient is φ = 106340.

The previous prime is 212683. The next prime is 212701. The reversal of 212684 is 486212.

Added to its reverse (486212) it gives a square (698896 = 836²).

212684 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (212683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26582 + ... + 26589.

It is an arithmetic number, because the mean of its divisors is an integer number (62034).

2²¹²⁶⁸⁴ is an apocalyptic number.

It is an amenable number.

212684 is a deficient number, since it is larger than the sum of its proper divisors (159520).

212684 is a wasteful number, since it uses less digits than its factorization.

212684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53175 (or 53173 counting only the distinct ones).

The product of its digits is 768, while the sum is 23.

The square root of 212684 is about 461.1767557022. The cubic root of 212684 is about 59.6913782281.

Adding to 212684 its reverse (486212), we get a palindrome (698896).

The spelling of 212684 in words is "two hundred twelve thousand, six hundred eighty-four".