212543 has 4 divisors (see below), whose sum is σ = 221808. Its totient is φ = 203280.

The previous prime is 212507. The next prime is 212557. The reversal of 212543 is 345212.

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

It is a cyclic number.

It is not a de Polignac number, because 212543 - 2⁶ = 212479 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212573) 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, 4598 + ... + 4643.

It is an arithmetic number, because the mean of its divisors is an integer number (55452).

2²¹²⁵⁴³ is an apocalyptic number.

212543 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

212543 is a deficient number, since it is larger than the sum of its proper divisors (9265).

212543 is an equidigital number, since it uses as much as digits as its factorization.

212543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9264.

The product of its digits is 240, while the sum is 17.

The square root of 212543 is about 461.0238605539. The cubic root of 212543 is about 59.6781844055.

Adding to 212543 its reverse (345212), we get a palindrome (557755).

The spelling of 212543 in words is "two hundred twelve thousand, five hundred forty-three".