10011199686821 has 2 divisors, whose sum is σ = 10011199686822. Its totient is φ = 10011199686820.

The previous prime is 10011199686799. The next prime is 10011199686827. The reversal of 10011199686821 is 12868699111001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7589534617921 + 2421665068900 = 2754911^2 + 1556170^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10011199686821 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10011199686827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5005599843410 + 5005599843411.

It is an arithmetic number, because the mean of its divisors is an integer number (5005599843411).

Almost surely, 2^{10011199686821} is an apocalyptic number.

It is an amenable number.

10011199686821 is a deficient number, since it is larger than the sum of its proper divisors (1).

10011199686821 is an equidigital number, since it uses as much as digits as its factorization.

10011199686821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 373248, while the sum is 53.

The spelling of 10011199686821 in words is "ten trillion, eleven billion, one hundred ninety-nine million, six hundred eighty-six thousand, eight hundred twenty-one".