213231223 has 4 divisors (see below), whose sum is σ = 213365520. Its totient is φ = 213096928.

The previous prime is 213231197. The next prime is 213231353. The reversal of 213231223 is 322132312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213231223 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 213231223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213237223) 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, 64738 + ... + 67951.

It is an arithmetic number, because the mean of its divisors is an integer number (53341380).

Almost surely, 2^213231223 is an apocalyptic number.

213231223 is a deficient number, since it is larger than the sum of its proper divisors (134297).

213231223 is a wasteful number, since it uses less digits than its factorization.

213231223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134296.

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

The square root of 213231223 is about 14602.4389401223. The cubic root of 213231223 is about 597.4252847992.

Adding to 213231223 its reverse (322132312), we get a palindrome (535363535).

The spelling of 213231223 in words is "two hundred thirteen million, two hundred thirty-one thousand, two hundred twenty-three".