212347 has 4 divisors (see below), whose sum is σ = 224856. Its totient is φ = 199840.

The previous prime is 212297. The next prime is 212353. The reversal of 212347 is 743212.

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 212347 - 2¹¹ = 210299 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 (212447) 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, 6229 + ... + 6262.

It is an arithmetic number, because the mean of its divisors is an integer number (56214).

2²¹²³⁴⁷ is an apocalyptic number.

212347 is a deficient number, since it is larger than the sum of its proper divisors (12509).

212347 is a wasteful number, since it uses less digits than its factorization.

212347 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12508.

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

The square root of 212347 is about 460.8112411823. The cubic root of 212347 is about 59.6598343595.

Adding to 212347 its reverse (743212), we get a palindrome (955559).

The spelling of 212347 in words is "two hundred twelve thousand, three hundred forty-seven", and thus it is an iban number.