502130021 has 2 divisors, whose sum is σ = 502130022. Its totient is φ = 502130020.

The previous prime is 502130017. The next prime is 502130051. The reversal of 502130021 is 120031205.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 268468225 + 233661796 = 16385^2 + 15286^2 .

It is a cyclic number.

It is not a de Polignac number, because 502130021 - 2² = 502130017 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 502129978 and 502130005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (502130051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 251065010 + 251065011.

It is an arithmetic number, because the mean of its divisors is an integer number (251065011).

Almost surely, 2^502130021 is an apocalyptic number.

It is an amenable number.

502130021 is a deficient number, since it is larger than the sum of its proper divisors (1).

502130021 is an equidigital number, since it uses as much as digits as its factorization.

502130021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 60, while the sum is 14.

The square root of 502130021 is about 22408.2578751674. The cubic root of 502130021 is about 794.8259951705.

Adding to 502130021 its reverse (120031205), we get a palindrome (622161226).

The spelling of 502130021 in words is "five hundred two million, one hundred thirty thousand, twenty-one".