505235021 has 2 divisors, whose sum is σ = 505235022. Its totient is φ = 505235020.

The previous prime is 505234991. The next prime is 505235041. The reversal of 505235021 is 120532505.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 461820100 + 43414921 = 21490^2 + 6589^2 .

It is a cyclic number.

It is not a de Polignac number, because 505235021 - 2⁶ = 505234957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (505235041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252617510 + 252617511.

It is an arithmetic number, because the mean of its divisors is an integer number (252617511).

Almost surely, 2^505235021 is an apocalyptic number.

It is an amenable number.

505235021 is a deficient number, since it is larger than the sum of its proper divisors (1).

505235021 is an equidigital number, since it uses as much as digits as its factorization.

505235021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1500, while the sum is 23.

The square root of 505235021 is about 22477.4335946077. The cubic root of 505235021 is about 796.4609403452.

Adding to 505235021 its reverse (120532505), we get a palindrome (625767526).

The spelling of 505235021 in words is "five hundred five million, two hundred thirty-five thousand, twenty-one".