1312516351021 has 2 divisors, whose sum is σ = 1312516351022. Its totient is φ = 1312516351020.

The previous prime is 1312516350991. The next prime is 1312516351057. The reversal of 1312516351021 is 1201536152131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 818637705796 + 493878645225 = 904786^2 + 702765^2 .

It is a cyclic number.

It is not a de Polignac number, because 1312516351021 - 2¹³ = 1312516342829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1312516351121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656258175510 + 656258175511.

It is an arithmetic number, because the mean of its divisors is an integer number (656258175511).

Almost surely, 2^{1312516351021} is an apocalyptic number.

It is an amenable number.

1312516351021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1312516351021 is an equidigital number, since it uses as much as digits as its factorization.

1312516351021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5400, while the sum is 31.

The spelling of 1312516351021 in words is "one trillion, three hundred twelve billion, five hundred sixteen million, three hundred fifty-one thousand, twenty-one".