12111111020 has 12 divisors (see below), whose sum is σ = 25433333184. Its totient is φ = 4844444400.

The previous prime is 12111110933. The next prime is 12111111029. The reversal of 12111111020 is 2011111121.

12111111020 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 12111110992 and 12111111010.

It is not an unprimeable number, because it can be changed into a prime (12111111029) 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, 302777756 + ... + 302777795.

It is an arithmetic number, because the mean of its divisors is an integer number (2119444432).

Almost surely, 2^12111111020 is an apocalyptic number.

12111111020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12111111020 is an abundant number, since it is smaller than the sum of its proper divisors (13322222164).

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

12111111020 is a wasteful number, since it uses less digits than its factorization.

12111111020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 605555560 (or 605555558 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 12111111020 its reverse (2011111121), we get a palindrome (14122222141).

The spelling of 12111111020 in words is "twelve billion, one hundred eleven million, one hundred eleven thousand, twenty".