13321221 has 8 divisors (see below), whose sum is σ = 18241824. Its totient is φ = 8640720.

The previous prime is 13321219. The next prime is 13321229. The reversal of 13321221 is 12212331.

13321221 = T₈₃₀ + T₈₃₁ + ... + T₈₆₆.

13321221 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 13321221 - 2¹ = 13321219 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13321221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13321229) 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, 59895 + ... + 60116.

It is an arithmetic number, because the mean of its divisors is an integer number (2280228).

Almost surely, 2^13321221 is an apocalyptic number.

It is an amenable number.

13321221 is a deficient number, since it is larger than the sum of its proper divisors (4920603).

13321221 is a wasteful number, since it uses less digits than its factorization.

13321221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120051.

The product of its digits is 72, while the sum is 15.

The square root of 13321221 is about 3649.8247903153. The cubic root of 13321221 is about 237.0543947500.

Adding to 13321221 its reverse (12212331), we get a palindrome (25533552).

The spelling of 13321221 in words is "thirteen million, three hundred twenty-one thousand, two hundred twenty-one".