13221316 has 6 divisors (see below), whose sum is σ = 23137310. Its totient is φ = 6610656.

The previous prime is 13221293. The next prime is 13221317. The reversal of 13221316 is 61312231.

It can be written as a sum of positive squares in only one way, i.e., 12110400 + 1110916 = 3480^2 + 1054^2 .

It is a super-3 number, since 3×13221316³ (a number of 22 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 13221293 and 13221302.

It is not an unprimeable number, because it can be changed into a prime (13221317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1652661 + ... + 1652668.

Almost surely, 2^13221316 is an apocalyptic number.

It is an amenable number.

13221316 is a deficient number, since it is larger than the sum of its proper divisors (9915994).

13221316 is a wasteful number, since it uses less digits than its factorization.

13221316 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3305333 (or 3305331 counting only the distinct ones).

The product of its digits is 216, while the sum is 19.

The square root of 13221316 is about 3636.1127595277. The cubic root of 13221316 is about 236.4602957542.

Adding to 13221316 its reverse (61312231), we get a palindrome (74533547).

The spelling of 13221316 in words is "thirteen million, two hundred twenty-one thousand, three hundred sixteen".