522106021 has 6 divisors (see below), whose sum is σ = 532145810. Its totient is φ = 512252208.

The previous prime is 522106007. The next prime is 522106027. The reversal of 522106021 is 120601225.

It can be written as a sum of positive squares in 3 ways, for example, as 146289025 + 375816996 = 12095^2 + 19386^2 .

It is not a de Polignac number, because 522106021 - 2¹¹ = 522103973 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 522106021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (522106027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 90126 + ... + 95743.

Almost surely, 2^522106021 is an apocalyptic number.

It is an amenable number.

522106021 is a deficient number, since it is larger than the sum of its proper divisors (10039789).

522106021 is an equidigital number, since it uses as much as digits as its factorization.

522106021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185975 (or 185922 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 522106021 is about 22849.6394063451. The cubic root of 522106021 is about 805.2292962026.

Adding to 522106021 its reverse (120601225), we get a palindrome (642707246).

The spelling of 522106021 in words is "five hundred twenty-two million, one hundred six thousand, twenty-one".