521571216013 has 2 divisors, whose sum is σ = 521571216014. Its totient is φ = 521571216012.

The previous prime is 521571215999. The next prime is 521571216017. The reversal of 521571216013 is 310612175125.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 309894849124 + 211676366889 = 556682^2 + 460083^2 .

It is a cyclic number.

It is not a de Polignac number, because 521571216013 - 2¹³ = 521571207821 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 521571216013.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (521571216017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260785608006 + 260785608007.

It is an arithmetic number, because the mean of its divisors is an integer number (260785608007).

Almost surely, 2^521571216013 is an apocalyptic number.

It is an amenable number.

521571216013 is a deficient number, since it is larger than the sum of its proper divisors (1).

521571216013 is an equidigital number, since it uses as much as digits as its factorization.

521571216013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12600, while the sum is 34.

The spelling of 521571216013 in words is "five hundred twenty-one billion, five hundred seventy-one million, two hundred sixteen thousand, thirteen".