505223522021 has 2 divisors, whose sum is σ = 505223522022. Its totient is φ = 505223522020.

The previous prime is 505223522003. The next prime is 505223522051. The reversal of 505223522021 is 120225322505.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 257059140100 + 248164381921 = 507010^2 + 498161^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-505223522021 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (505223522051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252611761010 + 252611761011.

It is an arithmetic number, because the mean of its divisors is an integer number (252611761011).

Almost surely, 2^505223522021 is an apocalyptic number.

It is an amenable number.

505223522021 is a deficient number, since it is larger than the sum of its proper divisors (1).

505223522021 is an equidigital number, since it uses as much as digits as its factorization.

505223522021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12000, while the sum is 29.

Adding to 505223522021 its reverse (120225322505), we get a palindrome (625448844526).

The spelling of 505223522021 in words is "five hundred five billion, two hundred twenty-three million, five hundred twenty-two thousand, twenty-one".