13361221 has 2 divisors, whose sum is σ = 13361222. Its totient is φ = 13361220.

The previous prime is 13361219. The next prime is 13361267. The reversal of 13361221 is 12216331.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12173121 + 1188100 = 3489^2 + 1090^2 .

It is a cyclic number.

It is not a de Polignac number, because 13361221 - 2¹ = 13361219 is a prime.

It is a super-2 number, since 2×13361221² = 357044453221682, which contains 22 as substring.

Together with 13361219, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13361291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6680610 + 6680611.

It is an arithmetic number, because the mean of its divisors is an integer number (6680611).

Almost surely, 2^13361221 is an apocalyptic number.

It is an amenable number.

13361221 is a deficient number, since it is larger than the sum of its proper divisors (1).

13361221 is an equidigital number, since it uses as much as digits as its factorization.

13361221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 216, while the sum is 19.

The square root of 13361221 is about 3655.3003980521. The cubic root of 13361221 is about 237.2914275964.

Adding to 13361221 its reverse (12216331), we get a palindrome (25577552).

The spelling of 13361221 in words is "thirteen million, three hundred sixty-one thousand, two hundred twenty-one".