505011021 has 4 divisors (see below), whose sum is σ = 673348032. Its totient is φ = 336674012.

The previous prime is 505011011. The next prime is 505011037. The reversal of 505011021 is 120110505.

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 505011021 - 2⁹ = 505010509 is a prime.

It is a super-2 number, since 2×505011021² = 510072262662924882, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505011011) 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 3 ways as a sum of consecutive naturals, for example, 84168501 + ... + 84168506.

It is an arithmetic number, because the mean of its divisors is an integer number (168337008).

Almost surely, 2^505011021 is an apocalyptic number.

It is an amenable number.

505011021 is a deficient number, since it is larger than the sum of its proper divisors (168337011).

505011021 is a wasteful number, since it uses less digits than its factorization.

505011021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168337010.

The product of its (nonzero) digits is 50, while the sum is 15.

The square root of 505011021 is about 22472.4502669380. The cubic root of 505011021 is about 796.3432171630.

Adding to 505011021 its reverse (120110505), we get a palindrome (625121526).

The spelling of 505011021 in words is "five hundred five million, eleven thousand, twenty-one".