11108478721 has 2 divisors, whose sum is σ = 11108478722. Its totient is φ = 11108478720.

The previous prime is 11108478709. The next prime is 11108478727. The reversal of 11108478721 is 12787480111.

11108478721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9396588096 + 1711890625 = 96936^2 + 41375^2 .

It is a cyclic number.

It is not a de Polignac number, because 11108478721 - 2⁷ = 11108478593 is a prime.

It is not a weakly prime, because it can be changed into another prime (11108478727) 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, 5554239360 + 5554239361.

It is an arithmetic number, because the mean of its divisors is an integer number (5554239361).

Almost surely, 2^11108478721 is an apocalyptic number.

It is an amenable number.

11108478721 is a deficient number, since it is larger than the sum of its proper divisors (1).

11108478721 is an equidigital number, since it uses as much as digits as its factorization.

11108478721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25088, while the sum is 40.

The spelling of 11108478721 in words is "eleven billion, one hundred eight million, four hundred seventy-eight thousand, seven hundred twenty-one".