212723 has 4 divisors (see below), whose sum is σ = 243120. Its totient is φ = 182328.

The previous prime is 212701. The next prime is 212777. The reversal of 212723 is 327212.

212723 is nontrivially palindromic in base 4.

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 212723 - 2⁸ = 212467 is a prime.

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

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212123) 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, 15188 + ... + 15201.

It is an arithmetic number, because the mean of its divisors is an integer number (60780).

2²¹²⁷²³ is an apocalyptic number.

212723 is a deficient number, since it is larger than the sum of its proper divisors (30397).

212723 is an equidigital number, since it uses as much as digits as its factorization.

212723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30396.

The product of its digits is 168, while the sum is 17.

The square root of 212723 is about 461.2190369011. The cubic root of 212723 is about 59.6950265538.

Adding to 212723 its reverse (327212), we get a palindrome (539935).

It can be divided in two parts, 21 and 2723, that added together give a cube (2744 = 14³).

The spelling of 212723 in words is "two hundred twelve thousand, seven hundred twenty-three", and thus it is an iban number.