13408221 has 8 divisors (see below), whose sum is σ = 17894880. Its totient is φ = 8930192.

The previous prime is 13408211. The next prime is 13408229. The reversal of 13408221 is 12280431.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 13408221 - 2⁷ = 13408093 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 (13408229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3910 + ... + 6488.

It is an arithmetic number, because the mean of its divisors is an integer number (2236860).

Almost surely, 2^13408221 is an apocalyptic number.

It is an amenable number.

13408221 is a deficient number, since it is larger than the sum of its proper divisors (4486659).

13408221 is a wasteful number, since it uses less digits than its factorization.

13408221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4315.

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 13408221 is about 3661.7237743992. The cubic root of 13408221 is about 237.5693374652.

Adding to 13408221 its reverse (12280431), we get a palindrome (25688652).

The spelling of 13408221 in words is "thirteen million, four hundred eight thousand, two hundred twenty-one".