212643 has 6 divisors (see below), whose sum is σ = 307164. Its totient is φ = 141756.

The previous prime is 212633. The next prime is 212651. The reversal of 212643 is 346212.

It is a happy number.

212643 is a `hidden beast` number, since 21 + 2 + 643 = 666.

It is not a de Polignac number, because 212643 - 2⁴ = 212627 is a prime.

It is not an unprimeable number, because it can be changed into a prime (212633) 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 in 5 ways as a sum of consecutive naturals, for example, 11805 + ... + 11822.

It is an arithmetic number, because the mean of its divisors is an integer number (51194).

2²¹²⁶⁴³ is an apocalyptic number.

212643 is a deficient number, since it is larger than the sum of its proper divisors (94521).

212643 is a wasteful number, since it uses less digits than its factorization.

212643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23633 (or 23630 counting only the distinct ones).

The product of its digits is 288, while the sum is 18.

The square root of 212643 is about 461.1323020566. The cubic root of 212643 is about 59.6875423279.

Adding to 212643 its reverse (346212), we get a palindrome (558855).

The spelling of 212643 in words is "two hundred twelve thousand, six hundred forty-three".