2011223111 has 4 divisors (see below), whose sum is σ = 2012453352. Its totient is φ = 2009992872.

The previous prime is 2011223099. The next prime is 2011223153. The reversal of 2011223111 is 1113221102.

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 2011223111 - 2¹⁸ = 2010960967 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2011223161) 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, 612665 + ... + 615938.

It is an arithmetic number, because the mean of its divisors is an integer number (503113338).

Almost surely, 2^2011223111 is an apocalyptic number.

2011223111 is a deficient number, since it is larger than the sum of its proper divisors (1230241).

2011223111 is a wasteful number, since it uses less digits than its factorization.

2011223111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1230240.

The product of its (nonzero) digits is 24, while the sum is 14.

The square root of 2011223111 is about 44846.6622057874. The cubic root of 2011223111 is about 1262.2733609574.

Adding to 2011223111 its reverse (1113221102), we get a palindrome (3124444213).

The spelling of 2011223111 in words is "two billion, eleven million, two hundred twenty-three thousand, one hundred eleven".