13220221 has 16 divisors (see below), whose sum is σ = 15611904. Its totient is φ = 10959984.

The previous prime is 13220213. The next prime is 13220231. The reversal of 13220221 is 12202231.

It is not a de Polignac number, because 13220221 - 2³ = 13220213 is a prime.

13220221 is a Rhonda number in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13220231) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50136 + ... + 50398.

It is an arithmetic number, because the mean of its divisors is an integer number (975744).

Almost surely, 2^13220221 is an apocalyptic number.

It is an amenable number.

13220221 is a deficient number, since it is larger than the sum of its proper divisors (2391683).

13220221 is a wasteful number, since it uses less digits than its factorization.

13220221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 480.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 13220221 is about 3635.9621835217. The cubic root of 13220221 is about 236.4537676301.

Adding to 13220221 its reverse (12202231), we get a palindrome (25422452).

The spelling of 13220221 in words is "thirteen million, two hundred twenty thousand, two hundred twenty-one".