13221867 has 4 divisors (see below), whose sum is σ = 17629160. Its totient is φ = 8814576.

The previous prime is 13221863. The next prime is 13221877. The reversal of 13221867 is 76812231.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 13221867 - 2² = 13221863 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13221863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2203642 + ... + 2203647.

It is an arithmetic number, because the mean of its divisors is an integer number (4407290).

Almost surely, 2^13221867 is an apocalyptic number.

13221867 is a deficient number, since it is larger than the sum of its proper divisors (4407293).

13221867 is an equidigital number, since it uses as much as digits as its factorization.

13221867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4407292.

The product of its digits is 4032, while the sum is 30.

The square root of 13221867 is about 3636.1885264656. The cubic root of 13221867 is about 236.4635805460.

The spelling of 13221867 in words is "thirteen million, two hundred twenty-one thousand, eight hundred sixty-seven".