512321445603421 has 2 divisors, whose sum is σ = 512321445603422. Its totient is φ = 512321445603420.

The previous prime is 512321445603419. The next prime is 512321445603431. The reversal of 512321445603421 is 124306544123215.

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., 321111705768100 + 191209739835321 = 17919590^2 + 13827861^2 .

It is a cyclic number.

It is not a de Polignac number, because 512321445603421 - 2¹ = 512321445603419 is a prime.

Together with 512321445603419, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (512321445603431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 256160722801710 + 256160722801711.

It is an arithmetic number, because the mean of its divisors is an integer number (256160722801711).

Almost surely, 2^{512321445603421} is an apocalyptic number.

It is an amenable number.

512321445603421 is a deficient number, since it is larger than the sum of its proper divisors (1).

512321445603421 is an equidigital number, since it uses as much as digits as its factorization.

512321445603421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 691200, while the sum is 43.

Adding to 512321445603421 its reverse (124306544123215), we get a palindrome (636627989726636).

The spelling of 512321445603421 in words is "five hundred twelve trillion, three hundred twenty-one billion, four hundred forty-five million, six hundred three thousand, four hundred twenty-one".