121200121200 has 180 divisors, whose sum is σ = 392166056264. Its totient is φ = 31996800000.

The previous prime is 121200121157. The next prime is 121200121219. The reversal of 121200121200 is 2121002121.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

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, 12236250 + ... + 12246150.

Almost surely, 2^121200121200 is an apocalyptic number.

121200121200 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 121200121200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (196083028132).

121200121200 is an abundant number, since it is smaller than the sum of its proper divisors (270965935064).

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

121200121200 is a wasteful number, since it uses less digits than its factorization.

121200121200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10124 (or 10012 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 121200121200 its reverse (2121002121), we get a palindrome (123321123321).

The spelling of 121200121200 in words is "one hundred twenty-one billion, two hundred million, one hundred twenty-one thousand, two hundred".