13212223 has 4 divisors (see below), whose sum is σ = 13519528. Its totient is φ = 12904920.

The previous prime is 13212181. The next prime is 13212229. The reversal of 13212223 is 32221231.

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 13212223 - 2⁹ = 13211711 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13212197 and 13212206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13212229) 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, 153588 + ... + 153673.

It is an arithmetic number, because the mean of its divisors is an integer number (3379882).

Almost surely, 2^13212223 is an apocalyptic number.

13212223 is a deficient number, since it is larger than the sum of its proper divisors (307305).

13212223 is an equidigital number, since it uses as much as digits as its factorization.

13212223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307304.

The product of its digits is 144, while the sum is 16.

The square root of 13212223 is about 3634.8621707019. The cubic root of 13212223 is about 236.4060745612.

Adding to 13212223 its reverse (32221231), we get a palindrome (45433454).

The spelling of 13212223 in words is "thirteen million, two hundred twelve thousand, two hundred twenty-three".