522021 has 4 divisors (see below), whose sum is σ = 696032. Its totient is φ = 348012.

The previous prime is 522017. The next prime is 522037. The reversal of 522021 is 120225.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 522021 - 2² = 522017 is a prime.

It is a D-number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 521988 and 522006.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 522021.

It is not an unprimeable number, because it can be changed into a prime (522061) 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 in 3 ways as a sum of consecutive naturals, for example, 87001 + ... + 87006.

It is an arithmetic number, because the mean of its divisors is an integer number (174008).

2⁵²²⁰²¹ is an apocalyptic number.

It is an amenable number.

522021 is a deficient number, since it is larger than the sum of its proper divisors (174011).

522021 is a wasteful number, since it uses less digits than its factorization.

522021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174010.

The product of its (nonzero) digits is 40, while the sum is 12.

The square root of 522021 is about 722.5102075404. The cubic root of 522021 is about 80.5185585338.

Adding to 522021 its reverse (120225), we get a palindrome (642246).

The spelling of 522021 in words is "five hundred twenty-two thousand, twenty-one".