13223121 has 16 divisors (see below), whose sum is σ = 18137088. Its totient is φ = 8565200.

The previous prime is 13223087. The next prime is 13223123. The reversal of 13223121 is 12132231.

It is a cyclic number.

It is not a de Polignac number, because 13223121 - 2⁶ = 13223057 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 13223121.

It is not an unprimeable number, because it can be changed into a prime (13223123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26686 + ... + 27176.

It is an arithmetic number, because the mean of its divisors is an integer number (1133568).

Almost surely, 2^13223121 is an apocalyptic number.

It is an amenable number.

13223121 is a deficient number, since it is larger than the sum of its proper divisors (4913967).

13223121 is a wasteful number, since it uses less digits than its factorization.

13223121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 732.

The product of its digits is 72, while the sum is 15.

The square root of 13223121 is about 3636.3609556808. The cubic root of 13223121 is about 236.4710559390.

Adding to 13223121 its reverse (12132231), we get a palindrome (25355352).

The spelling of 13223121 in words is "thirteen million, two hundred twenty-three thousand, one hundred twenty-one".