11121022091 has 4 divisors (see below), whose sum is σ = 11182464384. Its totient is φ = 11059579800.

The previous prime is 11121022063. The next prime is 11121022097. The reversal of 11121022091 is 19022012111.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19022012111 = 653 ⋅29130187.

It is a cyclic number.

It is not a de Polignac number, because 11121022091 - 2³⁰ = 10047280267 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11121022097) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30720875 + ... + 30721236.

It is an arithmetic number, because the mean of its divisors is an integer number (2795616096).

Almost surely, 2^11121022091 is an apocalyptic number.

11121022091 is a deficient number, since it is larger than the sum of its proper divisors (61442293).

11121022091 is an equidigital number, since it uses as much as digits as its factorization.

11121022091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61442292.

The product of its (nonzero) digits is 72, while the sum is 20.

The spelling of 11121022091 in words is "eleven billion, one hundred twenty-one million, twenty-two thousand, ninety-one".