522421 has 4 divisors (see below), whose sum is σ = 532332. Its totient is φ = 512512.

The previous prime is 522413. The next prime is 522439. The reversal of 522421 is 124225.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 286225 + 236196 = 535^2 + 486^2 .

It is a cyclic number.

It is not a de Polignac number, because 522421 - 2³ = 522413 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 522395 and 522404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (522521) 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, 4876 + ... + 4981.

It is an arithmetic number, because the mean of its divisors is an integer number (133083).

2⁵²²⁴²¹ is an apocalyptic number.

It is an amenable number.

522421 is a deficient number, since it is larger than the sum of its proper divisors (9911).

522421 is an equidigital number, since it uses as much as digits as its factorization.

522421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9910.

The product of its digits is 160, while the sum is 16.

The square root of 522421 is about 722.7869672317. The cubic root of 522421 is about 80.5391191374.

Adding to 522421 its reverse (124225), we get a palindrome (646646).

The spelling of 522421 in words is "five hundred twenty-two thousand, four hundred twenty-one".