521413025321 has 2 divisors, whose sum is σ = 521413025322. Its totient is φ = 521413025320.

The previous prime is 521413025311. The next prime is 521413025363. The reversal of 521413025321 is 123520314125.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 500505311296 + 20907714025 = 707464^2 + 144595^2 .

It is a cyclic number.

It is not a de Polignac number, because 521413025321 - 2¹⁸ = 521412763177 is a prime.

It is not a weakly prime, because it can be changed into another prime (521413025311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260706512660 + 260706512661.

It is an arithmetic number, because the mean of its divisors is an integer number (260706512661).

Almost surely, 2^521413025321 is an apocalyptic number.

It is an amenable number.

521413025321 is a deficient number, since it is larger than the sum of its proper divisors (1).

521413025321 is an equidigital number, since it uses as much as digits as its factorization.

521413025321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7200, while the sum is 29.

Adding to 521413025321 its reverse (123520314125), we get a palindrome (644933339446).

The spelling of 521413025321 in words is "five hundred twenty-one billion, four hundred thirteen million, twenty-five thousand, three hundred twenty-one".