2111121191 has 4 divisors (see below), whose sum is σ = 2115681312. Its totient is φ = 2106561072.

The previous prime is 2111121161. The next prime is 2111121197. The reversal of 2111121191 is 1911211112.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2111121191 is a prime.

It is a super-3 number, since 3×2111121191³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2111121197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2279366 + ... + 2280291.

It is an arithmetic number, because the mean of its divisors is an integer number (528920328).

Almost surely, 2^2111121191 is an apocalyptic number.

2111121191 is a deficient number, since it is larger than the sum of its proper divisors (4560121).

2111121191 is an equidigital number, since it uses as much as digits as its factorization.

2111121191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4560120.

The product of its digits is 36, while the sum is 20.

The square root of 2111121191 is about 45946.9388643030. The cubic root of 2111121191 is about 1282.8357521310.

The spelling of 2111121191 in words is "two billion, one hundred eleven million, one hundred twenty-one thousand, one hundred ninety-one".