522521221 has 2 divisors, whose sum is σ = 522521222. Its totient is φ = 522521220.

The previous prime is 522521201. The next prime is 522521239. The reversal of 522521221 is 122125225.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 301404321 + 221116900 = 17361^2 + 14870^2 .

It is a cyclic number.

It is not a de Polignac number, because 522521221 - 2⁵ = 522521189 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 522521192 and 522521201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (522521201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 261260610 + 261260611.

It is an arithmetic number, because the mean of its divisors is an integer number (261260611).

Almost surely, 2^522521221 is an apocalyptic number.

It is an amenable number.

522521221 is a deficient number, since it is larger than the sum of its proper divisors (1).

522521221 is an equidigital number, since it uses as much as digits as its factorization.

522521221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 800, while the sum is 22.

The square root of 522521221 is about 22858.7230833220. The cubic root of 522521221 is about 805.4426900376.

Adding to 522521221 its reverse (122125225), we get a palindrome (644646446).

The spelling of 522521221 in words is "five hundred twenty-two million, five hundred twenty-one thousand, two hundred twenty-one".