13261582021 has 2 divisors, whose sum is σ = 13261582022. Its totient is φ = 13261582020.

The previous prime is 13261582001. The next prime is 13261582027. The reversal of 13261582021 is 12028516231.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10782537921 + 2479044100 = 103839^2 + 49790^2 .

It is a cyclic number.

It is not a de Polignac number, because 13261582021 - 2²¹ = 13259484869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13261582027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6630791010 + 6630791011.

It is an arithmetic number, because the mean of its divisors is an integer number (6630791011).

Almost surely, 2^13261582021 is an apocalyptic number.

It is an amenable number.

13261582021 is a deficient number, since it is larger than the sum of its proper divisors (1).

13261582021 is an equidigital number, since it uses as much as digits as its factorization.

13261582021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5760, while the sum is 31.

The spelling of 13261582021 in words is "thirteen billion, two hundred sixty-one million, five hundred eighty-two thousand, twenty-one".