13221408 has 24 divisors (see below), whose sum is σ = 34706448. Its totient is φ = 4407104.

The previous prime is 13221401. The next prime is 13221413. The reversal of 13221408 is 80412231.

It is a tau number, because it is divible by the number of its divisors (24).

It is not an unprimeable number, because it can be changed into a prime (13221401) 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 3 ways as a sum of consecutive naturals, for example, 68766 + ... + 68957.

It is an arithmetic number, because the mean of its divisors is an integer number (1446102).

Almost surely, 2^13221408 is an apocalyptic number.

It is an amenable number.

13221408 is an abundant number, since it is smaller than the sum of its proper divisors (21485040).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13221408 is a wasteful number, since it uses less digits than its factorization.

13221408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137736 (or 137728 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 13221408 is about 3636.1254103785. The cubic root of 13221408 is about 236.4608442194.

Adding to 13221408 its reverse (80412231), we get a palindrome (93633639).

The spelling of 13221408 in words is "thirteen million, two hundred twenty-one thousand, four hundred eight".