13221569 has 4 divisors (see below), whose sum is σ = 13264944. Its totient is φ = 13178196.

The previous prime is 13221553. The next prime is 13221577. The reversal of 13221569 is 96512231.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 96512231 = 6199 ⋅15569.

It is a cyclic number.

It is not a de Polignac number, because 13221569 - 2⁴ = 13221553 is a prime.

It is a super-2 number, since 2×13221569² = 349619773643522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13221599) 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 in 3 ways as a sum of consecutive naturals, for example, 21227 + ... + 21840.

It is an arithmetic number, because the mean of its divisors is an integer number (3316236).

Almost surely, 2^13221569 is an apocalyptic number.

It is an amenable number.

13221569 is a deficient number, since it is larger than the sum of its proper divisors (43375).

13221569 is an equidigital number, since it uses as much as digits as its factorization.

13221569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43374.

The product of its digits is 3240, while the sum is 29.

The square root of 13221569 is about 3636.1475492614. The cubic root of 13221569 is about 236.4618040275.

The spelling of 13221569 in words is "thirteen million, two hundred twenty-one thousand, five hundred sixty-nine".