506040306221 has 4 divisors (see below), whose sum is σ = 519717071292. Its totient is φ = 492363541152.

The previous prime is 506040306179. The next prime is 506040306227. The reversal of 506040306221 is 122603040605.

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

It can be written as a sum of positive squares in 2 ways, for example, as 333952228996 + 172088077225 = 577886^2 + 414835^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-506040306221 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 (506040306227) 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, 6838382480 + ... + 6838382553.

It is an arithmetic number, because the mean of its divisors is an integer number (129929267823).

Almost surely, 2^506040306221 is an apocalyptic number.

It is an amenable number.

506040306221 is a deficient number, since it is larger than the sum of its proper divisors (13676765071).

506040306221 is a wasteful number, since it uses less digits than its factorization.

506040306221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13676765070.

The product of its (nonzero) digits is 8640, while the sum is 29.

Adding to 506040306221 its reverse (122603040605), we get a palindrome (628643346826).

The spelling of 506040306221 in words is "five hundred six billion, forty million, three hundred six thousand, two hundred twenty-one".