121110121221100 has 144 divisors (see below), whose sum is σ = 289963412153856. Its totient is φ = 43540134880000.

The previous prime is 121110121221077. The next prime is 121110121221149. The reversal of 121110121221100 is 1122121011121.

It is a super-2 number, since 2×121110121221100² (a number of 29 digits) contains 22 as substring.

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, 75083277 + ... + 76679323.

It is an arithmetic number, because the mean of its divisors is an integer number (2013634806624).

Almost surely, 2^{121110121221100} is an apocalyptic number.

121110121221100 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 121110121221100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (144981706076928).

121110121221100 is an abundant number, since it is smaller than the sum of its proper divisors (168853290932756).

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

121110121221100 is a wasteful number, since it uses less digits than its factorization.

121110121221100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1596856 (or 1596849 counting only the distinct ones).

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

Adding to 121110121221100 its reverse (1122121011121), we get a palindrome (122232242232221).

The spelling of 121110121221100 in words is "one hundred twenty-one trillion, one hundred ten billion, one hundred twenty-one million, two hundred twenty-one thousand, one hundred".