520221 has 8 divisors (see below), whose sum is σ = 747040. Its totient is φ = 320112.

The previous prime is 520213. The next prime is 520241. The reversal of 520221 is 122025.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 520221 - 2³ = 520213 is a prime.

It is a Duffinian number.

520221 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 520197 and 520206.

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 520221.

It is not an unprimeable number, because it can be changed into a prime (520241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6631 + ... + 6708.

It is an arithmetic number, because the mean of its divisors is an integer number (93380).

2⁵²⁰²²¹ is an apocalyptic number.

It is an amenable number.

520221 is a deficient number, since it is larger than the sum of its proper divisors (226819).

520221 is a wasteful number, since it uses less digits than its factorization.

520221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13355.

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

The square root of 520221 is about 721.2634747441. The cubic root of 520221 is about 80.4259056146.

Adding to 520221 its reverse (122025), we get a palindrome (642246).

It can be divided in two parts, 520 and 221, that added together give a triangular number (741 = T₃₈).

The spelling of 520221 in words is "five hundred twenty thousand, two hundred twenty-one".