13223221 has 16 divisors (see below), whose sum is σ = 15321600. Its totient is φ = 11286000.

The previous prime is 13223213. The next prime is 13223237. The reversal of 13223221 is 12232231.

13223221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 13223221 - 2³ = 13223213 is a prime.

It is a super-2 number, since 2×13223221² = 349707147229682, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 13223195 and 13223204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13223201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31350 + ... + 31768.

It is an arithmetic number, because the mean of its divisors is an integer number (957600).

Almost surely, 2^13223221 is an apocalyptic number.

13223221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

13223221 is a deficient number, since it is larger than the sum of its proper divisors (2098379).

13223221 is a wasteful number, since it uses less digits than its factorization.

13223221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 600.

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

The square root of 13223221 is about 3636.3747056650. The cubic root of 13223221 is about 236.4716520425.

Adding to 13223221 its reverse (12232231), we get a palindrome (25455452).

The spelling of 13223221 in words is "thirteen million, two hundred twenty-three thousand, two hundred twenty-one".