212743 has 4 divisors (see below), whose sum is σ = 223960. Its totient is φ = 201528.

The previous prime is 212701. The next prime is 212777. The reversal of 212743 is 347212.

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 212743 - 2¹⁷ = 81671 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19), and also a Moran number because the ratio is a prime number: 11197 = 212743 / (2 + 1 + 2 + 7 + 4 + 3).

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

It is a Duffinian number.

212743 is a lucky number.

It is a zygodrome in base 2.

It is a self number, because there is not a number n which added to its sum of digits gives 212743.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212243) 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 3 ways as a sum of consecutive naturals, for example, 5580 + ... + 5617.

It is an arithmetic number, because the mean of its divisors is an integer number (55990).

2²¹²⁷⁴³ is an apocalyptic number.

212743 is a deficient number, since it is larger than the sum of its proper divisors (11217).

212743 is a wasteful number, since it uses less digits than its factorization.

212743 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11216.

The product of its digits is 336, while the sum is 19.

The square root of 212743 is about 461.2407180638. The cubic root of 212743 is about 59.6968973170.

Adding to 212743 its reverse (347212), we get a palindrome (559955).

The spelling of 212743 in words is "two hundred twelve thousand, seven hundred forty-three", and thus it is an iban number.