11123220091 has 16 divisors (see below), whose sum is σ = 11697573888. Its totient is φ = 10564948800.

The previous prime is 11123220029. The next prime is 11123220133. The reversal of 11123220091 is 19002232111.

It is a cyclic number.

It is not a de Polignac number, because 11123220091 - 2¹⁹ = 11122695803 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11123220001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 538150 + ... + 558436.

It is an arithmetic number, because the mean of its divisors is an integer number (731098368).

Almost surely, 2^11123220091 is an apocalyptic number.

11123220091 is a deficient number, since it is larger than the sum of its proper divisors (574353797).

11123220091 is a wasteful number, since it uses less digits than its factorization.

11123220091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20682.

The product of its (nonzero) digits is 216, while the sum is 22.

The spelling of 11123220091 in words is "eleven billion, one hundred twenty-three million, two hundred twenty thousand, ninety-one".