2111091121 has 4 divisors (see below), whose sum is σ = 2222201200. Its totient is φ = 1999981044.

The previous prime is 2111091113. The next prime is 2111091137. The reversal of 2111091121 is 1211901112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2111091121 - 2³ = 2111091113 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19), and also a Moran number because the ratio is a prime number: 111110059 = 2111091121 / (2 + 1 + 1 + 1 + 0 + 9 + 1 + 1 + 2 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2111091821) 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, 55555011 + ... + 55555048.

It is an arithmetic number, because the mean of its divisors is an integer number (555550300).

Almost surely, 2^2111091121 is an apocalyptic number.

It is an amenable number.

2111091121 is a deficient number, since it is larger than the sum of its proper divisors (111110079).

2111091121 is a wasteful number, since it uses less digits than its factorization.

2111091121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111110078.

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

The square root of 2111091121 is about 45946.6116378564. The cubic root of 2111091121 is about 1282.8296613620.

Adding to 2111091121 its reverse (1211901112), we get a palindrome (3322992233).

The spelling of 2111091121 in words is "two billion, one hundred eleven million, ninety-one thousand, one hundred twenty-one".