2011123443 has 32 divisors (see below), whose sum is σ = 3263694336. Its totient is φ = 1075327488.

The previous prime is 2011123441. The next prime is 2011123453. The reversal of 2011123443 is 3443211102.

It is not a de Polignac number, because 2011123443 - 2¹ = 2011123441 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (2011123441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 45480 + ... + 78042.

It is an arithmetic number, because the mean of its divisors is an integer number (101990448).

Almost surely, 2^2011123443 is an apocalyptic number.

2011123443 is a deficient number, since it is larger than the sum of its proper divisors (1252570893).

2011123443 is a wasteful number, since it uses less digits than its factorization.

2011123443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32763.

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 2011123443 is about 44845.5509833473. The cubic root of 2011123443 is about 1262.2525095762.

Adding to 2011123443 its reverse (3443211102), we get a palindrome (5454334545).

The spelling of 2011123443 in words is "two billion, eleven million, one hundred twenty-three thousand, four hundred forty-three".