11011212091 has 4 divisors (see below), whose sum is σ = 12012231384. Its totient is φ = 10010192800.

The previous prime is 11011212089. The next prime is 11011212097. The reversal of 11011212091 is 19021211011.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 11011212091 - 2¹ = 11011212089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11011212097) 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, 500509630 + ... + 500509651.

It is an arithmetic number, because the mean of its divisors is an integer number (3003057846).

Almost surely, 2^11011212091 is an apocalyptic number.

11011212091 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11011212091 is a deficient number, since it is larger than the sum of its proper divisors (1001019293).

11011212091 is a wasteful number, since it uses less digits than its factorization.

11011212091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1001019292.

The product of its (nonzero) digits is 36, while the sum is 19.

The spelling of 11011212091 in words is "eleven billion, eleven million, two hundred twelve thousand, ninety-one".