121110021221200 has 120 divisors (see below), whose sum is σ = 317555852312160. Its totient is φ = 44020930828800.

The previous prime is 121110021221159. The next prime is 121110021221201. The reversal of 121110021221200 is 2122120011121.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121110021221201) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4199227 + ... + 16119973.

It is an arithmetic number, because the mean of its divisors is an integer number (2646298769268).

Almost surely, 2^{121110021221200} is an apocalyptic number.

121110021221200 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 121110021221200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (158777926156080).

121110021221200 is an abundant number, since it is smaller than the sum of its proper divisors (196445831090960).

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

121110021221200 is a wasteful number, since it uses less digits than its factorization.

121110021221200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11923085 (or 11923074 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 121110021221200 its reverse (2122120011121), we get a palindrome (123232141232321).

The spelling of 121110021221200 in words is "one hundred twenty-one trillion, one hundred ten billion, twenty-one million, two hundred twenty-one thousand, two hundred".