13221289 has 2 divisors, whose sum is σ = 13221290. Its totient is φ = 13221288.

The previous prime is 13221287. The next prime is 13221293. The reversal of 13221289 is 98212231.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12425625 + 795664 = 3525^2 + 892^2 .

It is a cyclic number.

It is not a de Polignac number, because 13221289 - 2¹ = 13221287 is a prime.

It is a super-3 number, since 3×13221289³ (a number of 22 digits) contains 333 as substring.

Together with 13221287, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (13221287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6610644 + 6610645.

It is an arithmetic number, because the mean of its divisors is an integer number (6610645).

Almost surely, 2^13221289 is an apocalyptic number.

It is an amenable number.

13221289 is a deficient number, since it is larger than the sum of its proper divisors (1).

13221289 is an equidigital number, since it uses as much as digits as its factorization.

13221289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728, while the sum is 28.

The square root of 13221289 is about 3636.1090467696. The cubic root of 13221289 is about 236.4601347911.

The spelling of 13221289 in words is "thirteen million, two hundred twenty-one thousand, two hundred eighty-nine".