12813036521 has 2 divisors, whose sum is σ = 12813036522. Its totient is φ = 12813036520.

The previous prime is 12813036491. The next prime is 12813036557. The reversal of 12813036521 is 12563031821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12755443600 + 57592921 = 112940^2 + 7589^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12813036521 is a prime.

It is not a weakly prime, because it can be changed into another prime (12813036421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6406518260 + 6406518261.

It is an arithmetic number, because the mean of its divisors is an integer number (6406518261).

Almost surely, 2^12813036521 is an apocalyptic number.

It is an amenable number.

12813036521 is a deficient number, since it is larger than the sum of its proper divisors (1).

12813036521 is an equidigital number, since it uses as much as digits as its factorization.

12813036521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8640, while the sum is 32.

The spelling of 12813036521 in words is "twelve billion, eight hundred thirteen million, thirty-six thousand, five hundred twenty-one".