521324221 has 8 divisors (see below), whose sum is σ = 568904544. Its totient is φ = 473775120.

The previous prime is 521324207. The next prime is 521324231. The reversal of 521324221 is 122423125.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 521324221 - 2⁷ = 521324093 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 521324192 and 521324201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521324201) 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 7 ways as a sum of consecutive naturals, for example, 39730 + ... + 51196.

It is an arithmetic number, because the mean of its divisors is an integer number (71113068).

Almost surely, 2^521324221 is an apocalyptic number.

It is an amenable number.

521324221 is a deficient number, since it is larger than the sum of its proper divisors (47580323).

521324221 is a wasteful number, since it uses less digits than its factorization.

521324221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15611.

The product of its digits is 960, while the sum is 22.

The square root of 521324221 is about 22832.5255063911. The cubic root of 521324221 is about 804.8271794434.

Adding to 521324221 its reverse (122423125), we get a palindrome (643747346).

The spelling of 521324221 in words is "five hundred twenty-one million, three hundred twenty-four thousand, two hundred twenty-one".