521354321473 has 2 divisors, whose sum is σ = 521354321474. Its totient is φ = 521354321472.

The previous prime is 521354321377. The next prime is 521354321483. The reversal of 521354321473 is 374123453125.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 520666151184 + 688170289 = 721572^2 + 26233^2 .

It is a cyclic number.

It is not a de Polignac number, because 521354321473 - 2²¹ = 521352224321 is a prime.

It is not a weakly prime, because it can be changed into another prime (521354321483) 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, 260677160736 + 260677160737.

It is an arithmetic number, because the mean of its divisors is an integer number (260677160737).

Almost surely, 2^521354321473 is an apocalyptic number.

It is an amenable number.

521354321473 is a deficient number, since it is larger than the sum of its proper divisors (1).

521354321473 is an equidigital number, since it uses as much as digits as its factorization.

521354321473 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 302400, while the sum is 40.

Adding to 521354321473 its reverse (374123453125), we get a palindrome (895477774598).

The spelling of 521354321473 in words is "five hundred twenty-one billion, three hundred fifty-four million, three hundred twenty-one thousand, four hundred seventy-three".