2131111120 has 80 divisors (see below), whose sum is σ = 5239664640. Its totient is φ = 804787200.

The previous prime is 2131111057. The next prime is 2131111127. The reversal of 2131111120 is 211111312.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is a self number, because there is not a number n which added to its sum of digits gives 2131111120.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2131111127) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 91201 + ... + 112159.

It is an arithmetic number, because the mean of its divisors is an integer number (65495808).

Almost surely, 2^2131111120 is an apocalyptic number.

2131111120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2131111120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2619832320).

2131111120 is an abundant number, since it is smaller than the sum of its proper divisors (3108553520).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2131111120 is a wasteful number, since it uses less digits than its factorization.

2131111120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21044 (or 21038 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 13.

The square root of 2131111120 is about 46163.9591023127. The cubic root of 2131111120 is about 1286.8720401439.

Adding to 2131111120 its reverse (211111312), we get a palindrome (2342222432).

The spelling of 2131111120 in words is "two billion, one hundred thirty-one million, one hundred eleven thousand, one hundred twenty".