13453221 has 16 divisors (see below), whose sum is σ = 18373824. Its totient is φ = 8753664.

The previous prime is 13453213. The next prime is 13453247. The reversal of 13453221 is 12235431.

It is not a de Polignac number, because 13453221 - 2³ = 13453213 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13453201) 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 15 ways as a sum of consecutive naturals, for example, 23875 + ... + 24431.

It is an arithmetic number, because the mean of its divisors is an integer number (1148364).

Almost surely, 2^13453221 is an apocalyptic number.

It is an amenable number.

13453221 is a deficient number, since it is larger than the sum of its proper divisors (4920603).

13453221 is an equidigital number, since it uses as much as digits as its factorization.

13453221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 740.

The product of its digits is 720, while the sum is 21.

The square root of 13453221 is about 3667.8632744419. The cubic root of 13453221 is about 237.8348134659.

Adding to 13453221 its reverse (12235431), we get a palindrome (25688652).

The spelling of 13453221 in words is "thirteen million, four hundred fifty-three thousand, two hundred twenty-one".