212307 has 4 divisors (see below), whose sum is σ = 283080. Its totient is φ = 141536.

The previous prime is 212297. The next prime is 212353. The reversal of 212307 is 703212.

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 212307 - 2⁶ = 212243 is a prime.

It is an Ulam number.

It is a d-powerful number, because it can be written as 2¹¹ + 1 + 3¹¹ + 2¹⁵ + 0 + 7³ .

It is a D-number.

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

It is a plaindrome in base 11.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 212307.

It is not an unprimeable number, because it can be changed into a prime (212207) 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, 35382 + ... + 35387.

It is an arithmetic number, because the mean of its divisors is an integer number (70770).

2²¹²³⁰⁷ is an apocalyptic number.

212307 is a deficient number, since it is larger than the sum of its proper divisors (70773).

212307 is an equidigital number, since it uses as much as digits as its factorization.

212307 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70772.

The product of its (nonzero) digits is 84, while the sum is 15.

The square root of 212307 is about 460.7678374192. The cubic root of 212307 is about 59.6560880649.

Adding to 212307 its reverse (703212), we get a palindrome (915519).

The spelling of 212307 in words is "two hundred twelve thousand, three hundred seven", and thus it is an iban number.