121120200000 has 252 divisors, whose sum is σ = 433940155740. Its totient is φ = 32298240000.

The previous prime is 121120199971. The next prime is 121120200007. The reversal of 121120200000 is 2021121.

It can be written as a sum of positive squares in 6 ways, for example, as 117111790656 + 4008409344 = 342216^2 + 63312^2 .

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121120200007) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1766356 + ... + 1833644.

It is an arithmetic number, because the mean of its divisors is an integer number (1721984745).

Almost surely, 2^121120200000 is an apocalyptic number.

121120200000 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 121120200000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (216970077870).

121120200000 is an abundant number, since it is smaller than the sum of its proper divisors (312819955740).

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

121120200000 is an frugal number, since it uses more digits than its factorization.

121120200000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67332 (or 67299 counting only the distinct ones).

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

Adding to 121120200000 its reverse (2021121), we get a palindrome (121122221121).

The spelling of 121120200000 in words is "one hundred twenty-one billion, one hundred twenty million, two hundred thousand".