505716100221 has 4 divisors (see below), whose sum is σ = 674288133632. Its totient is φ = 337144066812.

The previous prime is 505716100187. The next prime is 505716100237. The reversal of 505716100221 is 122001617505.

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 not a de Polignac number, because 505716100221 - 2¹³ = 505716092029 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505716100261) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 84286016701 + ... + 84286016706.

It is an arithmetic number, because the mean of its divisors is an integer number (168572033408).

Almost surely, 2^505716100221 is an apocalyptic number.

It is an amenable number.

505716100221 is a deficient number, since it is larger than the sum of its proper divisors (168572033411).

505716100221 is a wasteful number, since it uses less digits than its factorization.

505716100221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168572033410.

The product of its (nonzero) digits is 4200, while the sum is 30.

Adding to 505716100221 its reverse (122001617505), we get a palindrome (627717717726).

The spelling of 505716100221 in words is "five hundred five billion, seven hundred sixteen million, one hundred thousand, two hundred twenty-one".