520243221 has 4 divisors (see below), whose sum is σ = 693657632. Its totient is φ = 346828812.

The previous prime is 520243211. The next prime is 520243249. The reversal of 520243221 is 122342025.

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 520243221 - 2⁵ = 520243189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520243201) 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 3 ways as a sum of consecutive naturals, for example, 86707201 + ... + 86707206.

It is an arithmetic number, because the mean of its divisors is an integer number (173414408).

Almost surely, 2^520243221 is an apocalyptic number.

It is an amenable number.

520243221 is a deficient number, since it is larger than the sum of its proper divisors (173414411).

520243221 is a wasteful number, since it uses less digits than its factorization.

520243221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173414410.

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 520243221 is about 22808.8408517399. The cubic root of 520243221 is about 804.2705071678.

Adding to 520243221 its reverse (122342025), we get a palindrome (642585246).

The spelling of 520243221 in words is "five hundred twenty million, two hundred forty-three thousand, two hundred twenty-one".