13261021 has 2 divisors, whose sum is σ = 13261022. Its totient is φ = 13261020.

The previous prime is 13261009. The next prime is 13261043. The reversal of 13261021 is 12016231.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12425625 + 835396 = 3525^2 + 914^2 .

It is a cyclic number.

It is not a de Polignac number, because 13261021 - 2⁹ = 13260509 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 13260986 and 13261004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13261051) 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, 6630510 + 6630511.

It is an arithmetic number, because the mean of its divisors is an integer number (6630511).

Almost surely, 2^13261021 is an apocalyptic number.

It is an amenable number.

13261021 is a deficient number, since it is larger than the sum of its proper divisors (1).

13261021 is an equidigital number, since it uses as much as digits as its factorization.

13261021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 13261021 is about 3641.5684807511. The cubic root of 13261021 is about 236.6967642297.

Adding to 13261021 its reverse (12016231), we get a palindrome (25277252).

The spelling of 13261021 in words is "thirteen million, two hundred sixty-one thousand, twenty-one".