11910947621 has 2 divisors, whose sum is σ = 11910947622. Its totient is φ = 11910947620.

The previous prime is 11910947567. The next prime is 11910947681. The reversal of 11910947621 is 12674901911.

11910947621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6106641025 + 5804306596 = 78145^2 + 76186^2 .

It is a cyclic number.

It is not a de Polignac number, because 11910947621 - 2⁶ = 11910947557 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 (11910947681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5955473810 + 5955473811.

It is an arithmetic number, because the mean of its divisors is an integer number (5955473811).

Almost surely, 2^11910947621 is an apocalyptic number.

It is an amenable number.

11910947621 is a deficient number, since it is larger than the sum of its proper divisors (1).

11910947621 is an equidigital number, since it uses as much as digits as its factorization.

11910947621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27216, while the sum is 41.

The spelling of 11910947621 in words is "eleven billion, nine hundred ten million, nine hundred forty-seven thousand, six hundred twenty-one".