2120111091 has 48 divisors (see below), whose sum is σ = 3754732800. Its totient is φ = 1169689248.

The previous prime is 2120111069. The next prime is 2120111093. The reversal of 2120111091 is 1901110212.

It is a happy number.

It is not a de Polignac number, because 2120111091 - 2¹⁰ = 2120110067 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2120111093) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 27840 + ... + 70818.

It is an arithmetic number, because the mean of its divisors is an integer number (78223600).

Almost surely, 2^2120111091 is an apocalyptic number.

2120111091 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

2120111091 is a deficient number, since it is larger than the sum of its proper divisors (1634621709).

2120111091 is an equidigital number, since it uses as much as digits as its factorization.

2120111091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43030 (or 43018 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 18.

The square root of 2120111091 is about 46044.6640882524. The cubic root of 2120111091 is about 1284.6540961595.

The spelling of 2120111091 in words is "two billion, one hundred twenty million, one hundred eleven thousand, ninety-one".