12011220108 has 120 divisors (see below), whose sum is σ = 32233459104. Its totient is φ = 3897849600.

The previous prime is 12011220107. The next prime is 12011220157. The reversal of 12011220108 is 80102211021.

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 (12011220107) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 11649553 + ... + 11650583.

Almost surely, 2^12011220108 is an apocalyptic number.

12011220108 is a gapful number since it is divisible by the number (18) 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 12011220108, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16116729552).

12011220108 is an abundant number, since it is smaller than the sum of its proper divisors (20222238996).

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

12011220108 is a wasteful number, since it uses less digits than its factorization.

12011220108 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1965 (or 1954 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 12011220108 its reverse (80102211021), we get a palindrome (92113431129).

The spelling of 12011220108 in words is "twelve billion, eleven million, two hundred twenty thousand, one hundred eight".