13221146 has 4 divisors (see below), whose sum is σ = 19831722. Its totient is φ = 6610572.

The previous prime is 13221139. The next prime is 13221149. The reversal of 13221146 is 64112231.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 64112231 = 37 ⋅1732763.

It can be written as a sum of positive squares in only one way, i.e., 13213225 + 7921 = 3635^2 + 89^2 .

It is not an unprimeable number, because it can be changed into a prime (13221149) 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, 3305285 + ... + 3305288.

Almost surely, 2^13221146 is an apocalyptic number.

13221146 is a deficient number, since it is larger than the sum of its proper divisors (6610576).

13221146 is an equidigital number, since it uses as much as digits as its factorization.

13221146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6610575.

The product of its digits is 288, while the sum is 20.

The square root of 13221146 is about 3636.0893828398. The cubic root of 13221146 is about 236.4592822791.

Adding to 13221146 its reverse (64112231), we get a palindrome (77333377).

The spelling of 13221146 in words is "thirteen million, two hundred twenty-one thousand, one hundred forty-six".