505212043321 has 2 divisors, whose sum is σ = 505212043322. Its totient is φ = 505212043320.

The previous prime is 505212043309. The next prime is 505212043327. The reversal of 505212043321 is 123340212505.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 340425571600 + 164786471721 = 583460^2 + 405939^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-505212043321 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 505212043321.

It is not a weakly prime, because it can be changed into another prime (505212043327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252606021660 + 252606021661.

It is an arithmetic number, because the mean of its divisors is an integer number (252606021661).

Almost surely, 2^505212043321 is an apocalyptic number.

It is an amenable number.

505212043321 is a deficient number, since it is larger than the sum of its proper divisors (1).

505212043321 is an equidigital number, since it uses as much as digits as its factorization.

505212043321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7200, while the sum is 28.

Adding to 505212043321 its reverse (123340212505), we get a palindrome (628552255826).

The spelling of 505212043321 in words is "five hundred five billion, two hundred twelve million, forty-three thousand, three hundred twenty-one".