13021247 has 2 divisors, whose sum is σ = 13021248. Its totient is φ = 13021246.

The previous prime is 13021219. The next prime is 13021273. The reversal of 13021247 is 74212031.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 13021247 - 2⁸ = 13020991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13021207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6510623 + 6510624.

It is an arithmetic number, because the mean of its divisors is an integer number (6510624).

Almost surely, 2^13021247 is an apocalyptic number.

13021247 is a deficient number, since it is larger than the sum of its proper divisors (1).

13021247 is an equidigital number, since it uses as much as digits as its factorization.

13021247 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 13021247 is about 3608.4965013146. The cubic root of 13021247 is about 235.2614985554.

Adding to 13021247 its reverse (74212031), we get a palindrome (87233278).

The spelling of 13021247 in words is "thirteen million, twenty-one thousand, two hundred forty-seven".