121122200021100 has 72 divisors (see below), whose sum is σ = 357059104410960. Its totient is φ = 31689833460480.

The previous prime is 121122200021089. The next prime is 121122200021101. The reversal of 121122200021100 is 1120002221121.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 121122200021100.

It is not an unprimeable number, because it can be changed into a prime (121122200021101) 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, 3808858315 + ... + 3808890114.

It is an arithmetic number, because the mean of its divisors is an integer number (4959154227930).

Almost surely, 2^{121122200021100} is an apocalyptic number.

121122200021100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121122200021100 is an abundant number, since it is smaller than the sum of its proper divisors (235936904389860).

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

121122200021100 is a wasteful number, since it uses less digits than its factorization.

121122200021100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7617748499 (or 7617748492 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 121122200021100 its reverse (1120002221121), we get a palindrome (122242202242221).

The spelling of 121122200021100 in words is "one hundred twenty-one trillion, one hundred twenty-two billion, two hundred million, twenty-one thousand, one hundred".