13119768821 has 2 divisors, whose sum is σ = 13119768822. Its totient is φ = 13119768820.

The previous prime is 13119768791. The next prime is 13119768911. The reversal of 13119768821 is 12886791131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8592363025 + 4527405796 = 92695^2 + 67286^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13119768821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13119768121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6559884410 + 6559884411.

It is an arithmetic number, because the mean of its divisors is an integer number (6559884411).

Almost surely, 2^13119768821 is an apocalyptic number.

It is an amenable number.

13119768821 is a deficient number, since it is larger than the sum of its proper divisors (1).

13119768821 is an equidigital number, since it uses as much as digits as its factorization.

13119768821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 145152, while the sum is 47.

The spelling of 13119768821 in words is "thirteen billion, one hundred nineteen million, seven hundred sixty-eight thousand, eight hundred twenty-one".