12120021121200 has 480 divisors, whose sum is σ = 41156674732800. Its totient is φ = 3044181504000.

The previous prime is 12120021121189. The next prime is 12120021121267. The reversal of 12120021121200 is 212112002121.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 12120021121200.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 268946670 + ... + 268991730.

It is an arithmetic number, because the mean of its divisors is an integer number (85743072360).

Almost surely, 2^{12120021121200} is an apocalyptic number.

12120021121200 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 12120021121200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20578337366400).

12120021121200 is an abundant number, since it is smaller than the sum of its proper divisors (29036653611600).

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

12120021121200 is a wasteful number, since it uses less digits than its factorization.

12120021121200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45301 (or 45290 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 12120021121200 its reverse (212112002121), we get a palindrome (12332133123321).

The spelling of 12120021121200 in words is "twelve trillion, one hundred twenty billion, twenty-one million, one hundred twenty-one thousand, two hundred".