13221023 has 4 divisors (see below), whose sum is σ = 13232640. Its totient is φ = 13209408.

The previous prime is 13221011. The next prime is 13221029. The reversal of 13221023 is 32012231.

It is a happy number.

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 13221023 - 2⁴ = 13221007 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13220989 and 13221007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13221029) 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, 3890 + ... + 6447.

It is an arithmetic number, because the mean of its divisors is an integer number (3308160).

Almost surely, 2^13221023 is an apocalyptic number.

13221023 is a deficient number, since it is larger than the sum of its proper divisors (11617).

13221023 is a wasteful number, since it uses less digits than its factorization.

13221023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11616.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 13221023 is about 3636.0724690248. The cubic root of 13221023 is about 236.4585489947.

Adding to 13221023 its reverse (32012231), we get a palindrome (45233254).

The spelling of 13221023 in words is "thirteen million, two hundred twenty-one thousand, twenty-three".