505163213021 has 2 divisors, whose sum is σ = 505163213022. Its totient is φ = 505163213020.

The previous prime is 505163213003. The next prime is 505163213033. The reversal of 505163213021 is 120312361505.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 420824664100 + 84338548921 = 648710^2 + 290411^2 .

It is a cyclic number.

It is not a de Polignac number, because 505163213021 - 2³⁸ = 230285306077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (505153213021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252581606510 + 252581606511.

It is an arithmetic number, because the mean of its divisors is an integer number (252581606511).

Almost surely, 2^505163213021 is an apocalyptic number.

It is an amenable number.

505163213021 is a deficient number, since it is larger than the sum of its proper divisors (1).

505163213021 is an equidigital number, since it uses as much as digits as its factorization.

505163213021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5400, while the sum is 29.

Adding to 505163213021 its reverse (120312361505), we get a palindrome (625475574526).

The spelling of 505163213021 in words is "five hundred five billion, one hundred sixty-three million, two hundred thirteen thousand, twenty-one".