11511468821 has 2 divisors, whose sum is σ = 11511468822. Its totient is φ = 11511468820.

The previous prime is 11511468803. The next prime is 11511468827. The reversal of 11511468821 is 12886411511.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8714222500 + 2797246321 = 93350^2 + 52889^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11511468821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11511468827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5755734410 + 5755734411.

It is an arithmetic number, because the mean of its divisors is an integer number (5755734411).

Almost surely, 2^11511468821 is an apocalyptic number.

It is an amenable number.

11511468821 is a deficient number, since it is larger than the sum of its proper divisors (1).

11511468821 is an equidigital number, since it uses as much as digits as its factorization.

11511468821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15360, while the sum is 38.

The spelling of 11511468821 in words is "eleven billion, five hundred eleven million, four hundred sixty-eight thousand, eight hundred twenty-one".