11011221211091 has 2 divisors, whose sum is σ = 11011221211092. Its totient is φ = 11011221211090.

The previous prime is 11011221211079. The next prime is 11011221211157. The reversal of 11011221211091 is 19011212211011.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11011221211091 is a prime.

It is not a weakly prime, because it can be changed into another prime (11011221261091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5505610605545 + 5505610605546.

It is an arithmetic number, because the mean of its divisors is an integer number (5505610605546).

Almost surely, 2^{11011221211091} is an apocalyptic number.

11011221211091 is a deficient number, since it is larger than the sum of its proper divisors (1).

11011221211091 is an equidigital number, since it uses as much as digits as its factorization.

11011221211091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 23.

The spelling of 11011221211091 in words is "eleven trillion, eleven billion, two hundred twenty-one million, two hundred eleven thousand, ninety-one".