121200120000 has 210 divisors, whose sum is σ = 434110155908. Its totient is φ = 32319936000.

The previous prime is 121200119941. The next prime is 121200120011. The reversal of 121200120000 is 21002121.

121200120000 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 191667 + ... + 528333.

Almost surely, 2^121200120000 is an apocalyptic number.

121200120000 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 121200120000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (217055077954).

121200120000 is an abundant number, since it is smaller than the sum of its proper divisors (312910035908).

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

121200120000 is an equidigital number, since it uses as much as digits as its factorization.

121200120000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336705 (or 336677 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 121200120000 its reverse (21002121), we get a palindrome (121221122121).

The spelling of 121200120000 in words is "one hundred twenty-one billion, two hundred million, one hundred twenty thousand".