505423221 has 4 divisors (see below), whose sum is σ = 673897632. Its totient is φ = 336948812.

The previous prime is 505423201. The next prime is 505423241. The reversal of 505423221 is 122324505.

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 an interprime number because it is at equal distance from previous prime (505423201) and next prime (505423241).

It is a cyclic number.

It is not a de Polignac number, because 505423221 - 2⁶ = 505423157 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 505423191 and 505423200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505423201) 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, 84237201 + ... + 84237206.

It is an arithmetic number, because the mean of its divisors is an integer number (168474408).

Almost surely, 2^505423221 is an apocalyptic number.

It is an amenable number.

505423221 is a deficient number, since it is larger than the sum of its proper divisors (168474411).

505423221 is a wasteful number, since it uses less digits than its factorization.

505423221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168474410.

The product of its (nonzero) digits is 2400, while the sum is 24.

The square root of 505423221 is about 22481.6196258188. The cubic root of 505423221 is about 796.5598219447.

Adding to 505423221 its reverse (122324505), we get a palindrome (627747726).

The spelling of 505423221 in words is "five hundred five million, four hundred twenty-three thousand, two hundred twenty-one".