13315021 has 2 divisors, whose sum is σ = 13315022. Its totient is φ = 13315020.

The previous prime is 13315007. The next prime is 13315039. The reversal of 13315021 is 12051331.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12859396 + 455625 = 3586^2 + 675^2 .

It is a cyclic number.

It is not a de Polignac number, because 13315021 - 2⁵ = 13314989 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 13314986 and 13315004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13315051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6657510 + 6657511.

It is an arithmetic number, because the mean of its divisors is an integer number (6657511).

Almost surely, 2^13315021 is an apocalyptic number.

It is an amenable number.

13315021 is a deficient number, since it is larger than the sum of its proper divisors (1).

13315021 is an equidigital number, since it uses as much as digits as its factorization.

13315021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90, while the sum is 16.

The square root of 13315021 is about 3648.9753356251. The cubic root of 13315021 is about 237.0176122028.

Adding to 13315021 its reverse (12051331), we get a palindrome (25366352).

The spelling of 13315021 in words is "thirteen million, three hundred fifteen thousand, twenty-one".