121200200000 has 336 divisors, whose sum is σ = 332163115200. Its totient is φ = 43507200000.

The previous prime is 121200199979. The next prime is 121200200053. The reversal of 121200200000 is 2002121.

It is a Harshad number since it is a multiple of its sum of digits (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 195799691 + ... + 195800309.

It is an arithmetic number, because the mean of its divisors is an integer number (988580700).

Almost surely, 2^121200200000 is an apocalyptic number.

121200200000 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 121200200000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (166081557600).

121200200000 is an abundant number, since it is smaller than the sum of its proper divisors (210962915200).

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

121200200000 is an frugal number, since it uses more digits than its factorization.

121200200000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 756 (or 726 counting only the distinct ones).

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

Adding to 121200200000 its reverse (2002121), we get a palindrome (121202202121).

The spelling of 121200200000 in words is "one hundred twenty-one billion, two hundred million, two hundred thousand".