12111120018 has 48 divisors (see below), whose sum is σ = 26389471680. Its totient is φ = 4014221472.

The previous prime is 12111120017. The next prime is 12111120101. The reversal of 12111120018 is 81002111121.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (12111120013) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2928280 + ... + 2932412.

It is an arithmetic number, because the mean of its divisors is an integer number (549780660).

Almost surely, 2^12111120018 is an apocalyptic number.

12111120018 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

12111120018 is an abundant number, since it is smaller than the sum of its proper divisors (14278351662).

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

12111120018 is a wasteful number, since it uses less digits than its factorization.

12111120018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5023 (or 5020 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 12111120018 its reverse (81002111121), we get a palindrome (93113231139).

The spelling of 12111120018 in words is "twelve billion, one hundred eleven million, one hundred twenty thousand, eighteen".