12001121100 has 108 divisors (see below), whose sum is σ = 39829653864. Its totient is φ = 3012042240.

The previous prime is 12001121089. The next prime is 12001121149. The reversal of 12001121100 is 112110021.

It is a happy number.

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

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, 376894 + ... + 407493.

Almost surely, 2^12001121100 is an apocalyptic number.

12001121100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12001121100 is an abundant number, since it is smaller than the sum of its proper divisors (27828532764).

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

12001121100 is a wasteful number, since it uses less digits than its factorization.

12001121100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 784424 (or 784414 counting only the distinct ones).

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

Adding to 12001121100 its reverse (112110021), we get a palindrome (12113231121).

The spelling of 12001121100 in words is "twelve billion, one million, one hundred twenty-one thousand, one hundred".