512345021 has 2 divisors, whose sum is σ = 512345022. Its totient is φ = 512345020.

The previous prime is 512344999. The next prime is 512345063. The reversal of 512345021 is 120543215.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 448168900 + 64176121 = 21170^2 + 8011^2 .

It is a cyclic number.

It is not a de Polignac number, because 512345021 - 2¹⁸ = 512082877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (512345081) 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, 256172510 + 256172511.

It is an arithmetic number, because the mean of its divisors is an integer number (256172511).

Almost surely, 2^512345021 is an apocalyptic number.

It is an amenable number.

512345021 is a deficient number, since it is larger than the sum of its proper divisors (1).

512345021 is an equidigital number, since it uses as much as digits as its factorization.

512345021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 512345021 is about 22635.0396730379. The cubic root of 512345021 is about 800.1796580882.

Adding to 512345021 its reverse (120543215), we get a palindrome (632888236).

The spelling of 512345021 in words is "five hundred twelve million, three hundred forty-five thousand, twenty-one".