213213223 has 4 divisors (see below), whose sum is σ = 217236168. Its totient is φ = 209190280.

The previous prime is 213213181. The next prime is 213213227. The reversal of 213213223 is 322312312.

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 213213223 - 2²¹ = 211116071 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 213213223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213213227) 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, 2011393 + ... + 2011498.

It is an arithmetic number, because the mean of its divisors is an integer number (54309042).

Almost surely, 2^213213223 is an apocalyptic number.

213213223 is a deficient number, since it is larger than the sum of its proper divisors (4022945).

213213223 is an equidigital number, since it uses as much as digits as its factorization.

213213223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4022944.

The product of its digits is 432, while the sum is 19.

The square root of 213213223 is about 14601.8225917178. The cubic root of 213213223 is about 597.4084736937.

Adding to 213213223 its reverse (322312312), we get a palindrome (535525535).

It can be divided in two parts, 2 and 13213223, that added together give a square (13213225 = 3635²).

The spelling of 213213223 in words is "two hundred thirteen million, two hundred thirteen thousand, two hundred twenty-three".