516221 has 4 divisors (see below), whose sum is σ = 519552. Its totient is φ = 512892.

The previous prime is 516209. The next prime is 516223. The reversal of 516221 is 122615.

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 a cyclic number.

It is not a de Polignac number, because 516221 - 2⁶ = 516157 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 516221.

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 516221.

It is not an unprimeable number, because it can be changed into a prime (516223) 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, 1421 + ... + 1746.

It is an arithmetic number, because the mean of its divisors is an integer number (129888).

2⁵¹⁶²²¹ is an apocalyptic number.

It is an amenable number.

516221 is a deficient number, since it is larger than the sum of its proper divisors (3331).

516221 is a wasteful number, since it uses less digits than its factorization.

516221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3330.

The product of its digits is 120, while the sum is 17.

The square root of 516221 is about 718.4852120956. The cubic root of 516221 is about 80.2192423610.

Adding to 516221 its reverse (122615), we get a palindrome (638836).

It can be divided in two parts, 516 and 221, that added together give a palindrome (737).

The spelling of 516221 in words is "five hundred sixteen thousand, two hundred twenty-one".