505851300221 has 2 divisors, whose sum is σ = 505851300222. Its totient is φ = 505851300220.

The previous prime is 505851300169. The next prime is 505851300277. The reversal of 505851300221 is 122003158505.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 464768064121 + 41083236100 = 681739^2 + 202690^2 .

It is a cyclic number.

It is not a de Polignac number, because 505851300221 - 2¹⁴ = 505851283837 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (505851302221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252925650110 + 252925650111.

It is an arithmetic number, because the mean of its divisors is an integer number (252925650111).

Almost surely, 2^505851300221 is an apocalyptic number.

It is an amenable number.

505851300221 is a deficient number, since it is larger than the sum of its proper divisors (1).

505851300221 is an equidigital number, since it uses as much as digits as its factorization.

505851300221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12000, while the sum is 32.

Adding to 505851300221 its reverse (122003158505), we get a palindrome (627854458726).

The spelling of 505851300221 in words is "five hundred five billion, eight hundred fifty-one million, three hundred thousand, two hundred twenty-one".