13246721 has 2 divisors, whose sum is σ = 13246722. Its totient is φ = 13246720.

The previous prime is 13246711. The next prime is 13246729. The reversal of 13246721 is 12764231.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10491121 + 2755600 = 3239^2 + 1660^2 .

It is a cyclic number.

It is not a de Polignac number, because 13246721 - 2⁶ = 13246657 is a prime.

It is not a weakly prime, because it can be changed into another prime (13246729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6623360 + 6623361.

It is an arithmetic number, because the mean of its divisors is an integer number (6623361).

Almost surely, 2^13246721 is an apocalyptic number.

It is an amenable number.

13246721 is a deficient number, since it is larger than the sum of its proper divisors (1).

13246721 is an equidigital number, since it uses as much as digits as its factorization.

13246721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2016, while the sum is 26.

The square root of 13246721 is about 3639.6045114820. The cubic root of 13246721 is about 236.6116531082.

The spelling of 13246721 in words is "thirteen million, two hundred forty-six thousand, seven hundred twenty-one".