516021 has 16 divisors (see below), whose sum is σ = 791040. Its totient is φ = 295920.

The previous prime is 516017. The next prime is 516023. The reversal of 516021 is 120615.

It is not a de Polignac number, because 516021 - 2² = 516017 is a prime.

516021 is a lucky number.

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 516021.

It is not an unprimeable number, because it can be changed into a prime (516023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 216 + ... + 1038.

It is an arithmetic number, because the mean of its divisors is an integer number (49440).

2⁵¹⁶⁰²¹ is an apocalyptic number.

It is an amenable number.

516021 is a deficient number, since it is larger than the sum of its proper divisors (275019).

516021 is a wasteful number, since it uses less digits than its factorization.

516021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 856.

The product of its (nonzero) digits is 60, while the sum is 15.

The square root of 516021 is about 718.3460169027. The cubic root of 516021 is about 80.2088812166.

Adding to 516021 its reverse (120615), we get a palindrome (636636).

The spelling of 516021 in words is "five hundred sixteen thousand, twenty-one".