212212223 has 4 divisors (see below), whose sum is σ = 214596720. Its totient is φ = 209827728.

The previous prime is 212212219. The next prime is 212212243. The reversal of 212212223 is 322212212.

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 212212223 - 2² = 212212219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212212213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1192115 + ... + 1192292.

It is an arithmetic number, because the mean of its divisors is an integer number (53649180).

Almost surely, 2^212212223 is an apocalyptic number.

212212223 is a deficient number, since it is larger than the sum of its proper divisors (2384497).

212212223 is an equidigital number, since it uses as much as digits as its factorization.

212212223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2384496.

The product of its digits is 192, while the sum is 17.

The square root of 212212223 is about 14567.5057233557. The cubic root of 212212223 is about 596.4720962218.

Adding to 212212223 its reverse (322212212), we get a palindrome (534424435).

The spelling of 212212223 in words is "two hundred twelve million, two hundred twelve thousand, two hundred twenty-three".