13521221532491 has 2 divisors, whose sum is σ = 13521221532492. Its totient is φ = 13521221532490.

The previous prime is 13521221532457. The next prime is 13521221532521. The reversal of 13521221532491 is 19423512212531.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 13521221532491 - 2³⁸ = 13246343625547 is a prime.

It is not a weakly prime, because it can be changed into another prime (13521221532191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6760610766245 + 6760610766246.

It is an arithmetic number, because the mean of its divisors is an integer number (6760610766246).

Almost surely, 2^{13521221532491} is an apocalyptic number.

13521221532491 is a deficient number, since it is larger than the sum of its proper divisors (1).

13521221532491 is an equidigital number, since it uses as much as digits as its factorization.

13521221532491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 129600, while the sum is 41.

The spelling of 13521221532491 in words is "thirteen trillion, five hundred twenty-one billion, two hundred twenty-one million, five hundred thirty-two thousand, four hundred ninety-one".