505021 has 8 divisors (see below), whose sum is σ = 569088. Its totient is φ = 444000.

The previous prime is 504991. The next prime is 505027. The reversal of 505021 is 120505.

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 505021 - 2⁵ = 504989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 504992 and 505010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 400 + ... + 1081.

It is an arithmetic number, because the mean of its divisors is an integer number (71136).

2⁵⁰⁵⁰²¹ is an apocalyptic number.

It is an amenable number.

505021 is a deficient number, since it is larger than the sum of its proper divisors (64067).

505021 is a wasteful number, since it uses less digits than its factorization.

505021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1523.

The product of its (nonzero) digits is 50, while the sum is 13.

The square root of 505021 is about 710.6482955724. The cubic root of 505021 is about 79.6348462366.

Adding to 505021 its reverse (120505), we get a palindrome (625526).

The spelling of 505021 in words is "five hundred five thousand, twenty-one".