13221455 has 16 divisors (see below), whose sum is σ = 17254944. Its totient is φ = 9667200.

The previous prime is 13221443. The next prime is 13221457. The reversal of 13221455 is 55412231.

It is not a de Polignac number, because 13221455 - 2⁸ = 13221199 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 13221455.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13221457) 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, 6005 + ... + 7905.

It is an arithmetic number, because the mean of its divisors is an integer number (1078434).

Almost surely, 2^13221455 is an apocalyptic number.

13221455 is a deficient number, since it is larger than the sum of its proper divisors (4033489).

13221455 is a wasteful number, since it uses less digits than its factorization.

13221455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2026.

The product of its digits is 1200, while the sum is 23.

The square root of 13221455 is about 3636.1318732961. The cubic root of 13221455 is about 236.4611244126.

Adding to 13221455 its reverse (55412231), we get a palindrome (68633686).

The spelling of 13221455 in words is "thirteen million, two hundred twenty-one thousand, four hundred fifty-five".