12120021200 has 60 divisors (see below), whose sum is σ = 33278123040. Its totient is φ = 4155434880.

The previous prime is 12120021197. The next prime is 12120021209. The reversal of 12120021200 is 212002121.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12120021209) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2161490 + ... + 2167089.

It is an arithmetic number, because the mean of its divisors is an integer number (554635384).

Almost surely, 2^12120021200 is an apocalyptic number.

12120021200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12120021200 is an abundant number, since it is smaller than the sum of its proper divisors (21158101840).

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

12120021200 is a wasteful number, since it uses less digits than its factorization.

12120021200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4328604 (or 4328593 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 12120021200 its reverse (212002121), we get a palindrome (12332023321).

The spelling of 12120021200 in words is "twelve billion, one hundred twenty million, twenty-one thousand, two hundred".