13217223 has 4 divisors (see below), whose sum is σ = 17622968. Its totient is φ = 8811480.

The previous prime is 13217221. The next prime is 13217233. The reversal of 13217223 is 32271231.

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

It is not a de Polignac number, because 13217223 - 2¹ = 13217221 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 13217223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13217221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2202868 + ... + 2202873.

It is an arithmetic number, because the mean of its divisors is an integer number (4405742).

Almost surely, 2^13217223 is an apocalyptic number.

13217223 is a deficient number, since it is larger than the sum of its proper divisors (4405745).

13217223 is an equidigital number, since it uses as much as digits as its factorization.

13217223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4405744.

The product of its digits is 504, while the sum is 21.

The square root of 13217223 is about 3635.5498896316. The cubic root of 13217223 is about 236.4358924376.

Adding to 13217223 its reverse (32271231), we get a palindrome (45488454).

The spelling of 13217223 in words is "thirteen million, two hundred seventeen thousand, two hundred twenty-three".