12111002100 has 108 divisors (see below), whose sum is σ = 37995755616. Its totient is φ = 3226666560.

The previous prime is 12111002077. The next prime is 12111002131. The reversal of 12111002100 is 120011121.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1095199 + ... + 1106201.

It is an arithmetic number, because the mean of its divisors is an integer number (351812552).

Almost surely, 2^12111002100 is an apocalyptic number.

12111002100 is a gapful number since it is divisible by the number (10) 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 12111002100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18997877808).

12111002100 is an abundant number, since it is smaller than the sum of its proper divisors (25884753516).

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

12111002100 is a wasteful number, since it uses less digits than its factorization.

12111002100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12246 (or 12236 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 12111002100 its reverse (120011121), we get a palindrome (12231013221).

The spelling of 12111002100 in words is "twelve billion, one hundred eleven million, two thousand, one hundred".