12001100 has 18 divisors (see below), whose sum is σ = 26042604. Its totient is φ = 4800400.

The previous prime is 12001097. The next prime is 12001109. The reversal of 12001100 is 110021.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (5).

It is not an unprimeable number, because it can be changed into a prime (12001109) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 59906 + ... + 60105.

Almost surely, 2^12001100 is an apocalyptic number.

12001100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12001100 is an abundant number, since it is smaller than the sum of its proper divisors (14041504).

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

12001100 is a wasteful number, since it uses less digits than its factorization.

12001100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120025 (or 120018 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 5.

The square root of 12001100 is about 3464.2603828234. The cubic root of 12001100 is about 228.9498437729.

Adding to 12001100 its reverse (110021), we get a palindrome (12111121).

The spelling of 12001100 in words is "twelve million, one thousand, one hundred".