212747 has 4 divisors (see below), whose sum is σ = 215520. Its totient is φ = 209976.

The previous prime is 212701. The next prime is 212777. The reversal of 212747 is 747212.

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 212747 - 2⁶ = 212683 is a prime.

It is a super-2 number, since 2×212747² = 90522572018, which contains 22 as substring.

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

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 212747.

It is not an unprimeable number, because it can be changed into a prime (212777) 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, 1268 + ... + 1425.

It is an arithmetic number, because the mean of its divisors is an integer number (53880).

2²¹²⁷⁴⁷ is an apocalyptic number.

212747 is a deficient number, since it is larger than the sum of its proper divisors (2773).

212747 is an equidigital number, since it uses as much as digits as its factorization.

212747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2772.

The product of its digits is 784, while the sum is 23.

The square root of 212747 is about 461.2450541740. The cubic root of 212747 is about 59.6972714556.

Adding to 212747 its product of digits (784), we get a triangular number (213531 = T₆₅₃).

Adding to 212747 its reverse (747212), we get a palindrome (959959).

It can be divided in two parts, 212 and 747, that added together give a palindrome (959).

The spelling of 212747 in words is "two hundred twelve thousand, seven hundred forty-seven", and thus it is an iban number.