521160442432321 has 2 divisors, whose sum is σ = 521160442432322. Its totient is φ = 521160442432320.

The previous prime is 521160442432319. The next prime is 521160442432351. The reversal of 521160442432321 is 123234244061125.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 475801079508225 + 45359362924096 = 21812865^2 + 6734936^2 .

It is a cyclic number.

It is not a de Polignac number, because 521160442432321 - 2¹ = 521160442432319 is a prime.

Together with 521160442432319, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (521160442432351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260580221216160 + 260580221216161.

It is an arithmetic number, because the mean of its divisors is an integer number (260580221216161).

Almost surely, 2^{521160442432321} is an apocalyptic number.

It is an amenable number.

521160442432321 is a deficient number, since it is larger than the sum of its proper divisors (1).

521160442432321 is an equidigital number, since it uses as much as digits as its factorization.

521160442432321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 276480, while the sum is 40.

Adding to 521160442432321 its reverse (123234244061125), we get a palindrome (644394686493446).

The spelling of 521160442432321 in words is "five hundred twenty-one trillion, one hundred sixty billion, four hundred forty-two million, four hundred thirty-two thousand, three hundred twenty-one".