20112111011 has 4 divisors (see below), whose sum is σ = 20145576024. Its totient is φ = 20078646000.

The previous prime is 20112110989. The next prime is 20112111109. The reversal of 20112111011 is 11011121102.

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 20112111011 - 2⁶ = 20112110947 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20112110983 and 20112111001.

It is not an unprimeable number, because it can be changed into a prime (20112141011) 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, 16731605 + ... + 16732806.

It is an arithmetic number, because the mean of its divisors is an integer number (5036394006).

Almost surely, 2^20112111011 is an apocalyptic number.

20112111011 is a deficient number, since it is larger than the sum of its proper divisors (33465013).

20112111011 is an equidigital number, since it uses as much as digits as its factorization.

20112111011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33465012.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 20112111011 its reverse (11011121102), we get a palindrome (31123232113).

The spelling of 20112111011 in words is "twenty billion, one hundred twelve million, one hundred eleven thousand, eleven".