521403212563 has 2 divisors, whose sum is σ = 521403212564. Its totient is φ = 521403212562.

The previous prime is 521403212471. The next prime is 521403212569. The reversal of 521403212563 is 365212304125.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 521403212563 - 2¹⁷ = 521403081491 is a prime.

It is a super-2 number, since 2×521403212563² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (521403212569) 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, 260701606281 + 260701606282.

It is an arithmetic number, because the mean of its divisors is an integer number (260701606282).

Almost surely, 2^521403212563 is an apocalyptic number.

521403212563 is a deficient number, since it is larger than the sum of its proper divisors (1).

521403212563 is an equidigital number, since it uses as much as digits as its factorization.

521403212563 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 43200, while the sum is 34.

Adding to 521403212563 its reverse (365212304125), we get a palindrome (886615516688).

The spelling of 521403212563 in words is "five hundred twenty-one billion, four hundred three million, two hundred twelve thousand, five hundred sixty-three".