13320221 has 2 divisors, whose sum is σ = 13320222. Its totient is φ = 13320220.

The previous prime is 13320217. The next prime is 13320233. The reversal of 13320221 is 12202331.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13039321 + 280900 = 3611^2 + 530^2 .

It is an emirp because it is prime and its reverse (12202331) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13320221 - 2² = 13320217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 13320196 and 13320205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13320271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6660110 + 6660111.

It is an arithmetic number, because the mean of its divisors is an integer number (6660111).

Almost surely, 2^13320221 is an apocalyptic number.

It is an amenable number.

13320221 is a deficient number, since it is larger than the sum of its proper divisors (1).

13320221 is an equidigital number, since it uses as much as digits as its factorization.

13320221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 13320221 is about 3649.6877948668. The cubic root of 13320221 is about 237.0484628532.

Adding to 13320221 its reverse (12202331), we get a palindrome (25522552).

The spelling of 13320221 in words is "thirteen million, three hundred twenty thousand, two hundred twenty-one".