2011220111 has 4 divisors (see below), whose sum is σ = 2011609824. Its totient is φ = 2010830400.

The previous prime is 2011220069. The next prime is 2011220117. The reversal of 2011220111 is 1110221102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1110221102 = 2 ⋅555110551.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2011220111 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2011220092 and 2011220101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2011220117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 187010 + ... + 197471.

It is an arithmetic number, because the mean of its divisors is an integer number (502902456).

Almost surely, 2^2011220111 is an apocalyptic number.

2011220111 is a deficient number, since it is larger than the sum of its proper divisors (389713).

2011220111 is an equidigital number, since it uses as much as digits as its factorization.

2011220111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 389712.

The product of its (nonzero) digits is 8, while the sum is 11.

The square root of 2011220111 is about 44846.6287584697. The cubic root of 2011220111 is about 1262.2727333423.

Adding to 2011220111 its reverse (1110221102), we get a palindrome (3121441213).

Subtracting from 2011220111 its reverse (1110221102), we obtain a palindrome (900999009).

The spelling of 2011220111 in words is "two billion, eleven million, two hundred twenty thousand, one hundred eleven".