521321124673 has 2 divisors, whose sum is σ = 521321124674. Its totient is φ = 521321124672.

The previous prime is 521321124661. The next prime is 521321124683. The reversal of 521321124673 is 376421123125.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 421191914049 + 100129210624 = 648993^2 + 316432^2 .

It is a cyclic number.

It is not a de Polignac number, because 521321124673 - 2²⁹ = 520784253761 is a prime.

It is not a weakly prime, because it can be changed into another prime (521321124683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260660562336 + 260660562337.

It is an arithmetic number, because the mean of its divisors is an integer number (260660562337).

Almost surely, 2^521321124673 is an apocalyptic number.

It is an amenable number.

521321124673 is a deficient number, since it is larger than the sum of its proper divisors (1).

521321124673 is an equidigital number, since it uses as much as digits as its factorization.

521321124673 is an evil number, because the sum of its binary digits is even.

The product of its digits is 60480, while the sum is 37.

Adding to 521321124673 its reverse (376421123125), we get a palindrome (897742247798).

The spelling of 521321124673 in words is "five hundred twenty-one billion, three hundred twenty-one million, one hundred twenty-four thousand, six hundred seventy-three".