500221321 has 4 divisors (see below), whose sum is σ = 500641812. Its totient is φ = 499800832.

The previous prime is 500221313. The next prime is 500221327. The reversal of 500221321 is 123122005.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 123122005 = 5 ⋅24624401.

It can be written as a sum of positive squares in 2 ways, for example, as 90725625 + 409495696 = 9525^2 + 20236^2 .

It is a cyclic number.

It is not a de Polignac number, because 500221321 - 2³ = 500221313 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 500221295 and 500221304.

It is not an unprimeable number, because it can be changed into a prime (500221327) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 208456 + ... + 210841.

It is an arithmetic number, because the mean of its divisors is an integer number (125160453).

Almost surely, 2^500221321 is an apocalyptic number.

It is an amenable number.

500221321 is a deficient number, since it is larger than the sum of its proper divisors (420491).

500221321 is a wasteful number, since it uses less digits than its factorization.

500221321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 420490.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 500221321 is about 22365.6281154811. The cubic root of 500221321 is about 793.8176171054.

Adding to 500221321 its reverse (123122005), we get a palindrome (623343326).

The spelling of 500221321 in words is "five hundred million, two hundred twenty-one thousand, three hundred twenty-one".