13271021 has 2 divisors, whose sum is σ = 13271022. Its totient is φ = 13271020.

The previous prime is 13270997. The next prime is 13271029. The reversal of 13271021 is 12017231.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10329796 + 2941225 = 3214^2 + 1715^2 .

It is an emirp because it is prime and its reverse (12017231) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13271021 is a prime.

It is a super-2 number, since 2×13271021² = 352239996764882, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13271029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6635510 + 6635511.

It is an arithmetic number, because the mean of its divisors is an integer number (6635511).

Almost surely, 2^13271021 is an apocalyptic number.

It is an amenable number.

13271021 is a deficient number, since it is larger than the sum of its proper divisors (1).

13271021 is an equidigital number, since it uses as much as digits as its factorization.

13271021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 84, while the sum is 17.

The square root of 13271021 is about 3642.9412567320. The cubic root of 13271021 is about 236.7562461485.

Adding to 13271021 its reverse (12017231), we get a palindrome (25288252).

The spelling of 13271021 in words is "thirteen million, two hundred seventy-one thousand, twenty-one".