505021211 has 4 divisors (see below), whose sum is σ = 505213800. Its totient is φ = 504828624.

The previous prime is 505021207. The next prime is 505021247. The reversal of 505021211 is 112120505.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 505021211 - 2² = 505021207 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 505021211.

It is not an unprimeable number, because it can be changed into a prime (505026211) 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 3 ways as a sum of consecutive naturals, for example, 92306 + ... + 97623.

It is an arithmetic number, because the mean of its divisors is an integer number (126303450).

Almost surely, 2^505021211 is an apocalyptic number.

505021211 is a deficient number, since it is larger than the sum of its proper divisors (192589).

505021211 is a wasteful number, since it uses less digits than its factorization.

505021211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192588.

The product of its (nonzero) digits is 100, while the sum is 17.

The square root of 505021211 is about 22472.6769878446. The cubic root of 505021211 is about 796.3485732724.

Adding to 505021211 its reverse (112120505), we get a palindrome (617141716).

The spelling of 505021211 in words is "five hundred five million, twenty-one thousand, two hundred eleven".