2011123223 has 4 divisors (see below), whose sum is σ = 2014383360. Its totient is φ = 2007863088.

The previous prime is 2011123217. The next prime is 2011123237. The reversal of 2011123223 is 3223211102.

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-2011123223 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 (2011173223) 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, 1629143 + ... + 1630376.

It is an arithmetic number, because the mean of its divisors is an integer number (503595840).

Almost surely, 2^2011123223 is an apocalyptic number.

2011123223 is a deficient number, since it is larger than the sum of its proper divisors (3260137).

2011123223 is an equidigital number, since it uses as much as digits as its factorization.

2011123223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3260136.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 2011123223 is about 44845.5485304840. The cubic root of 2011123223 is about 1262.2524635496.

Adding to 2011123223 its reverse (3223211102), we get a palindrome (5234334325).

It can be divided in two parts, 20111 and 23223, that added together give a palindrome (43334).

The spelling of 2011123223 in words is "two billion, eleven million, one hundred twenty-three thousand, two hundred twenty-three".