2113231111 has 4 divisors (see below), whose sum is σ = 2116831752. Its totient is φ = 2109630472.

The previous prime is 2113231097. The next prime is 2113231139. The reversal of 2113231111 is 1111323112.

It is a happy number.

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 2113231111 - 2⁷ = 2113230983 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 (2113031111) 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, 1799440 + ... + 1800613.

It is an arithmetic number, because the mean of its divisors is an integer number (529207938).

Almost surely, 2^2113231111 is an apocalyptic number.

2113231111 is a deficient number, since it is larger than the sum of its proper divisors (3600641).

2113231111 is an equidigital number, since it uses as much as digits as its factorization.

2113231111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3600640.

The product of its digits is 36, while the sum is 16.

The square root of 2113231111 is about 45969.8935282648. The cubic root of 2113231111 is about 1283.2629784485.

Adding to 2113231111 its reverse (1111323112), we get a palindrome (3224554223).

It can be divided in two parts, 211323111 and 1, that added together give a palindrome (211323112).

The spelling of 2113231111 in words is "two billion, one hundred thirteen million, two hundred thirty-one thousand, one hundred eleven".