121100133220 has 96 divisors (see below), whose sum is σ = 282199075200. Its totient is φ = 43285632000.

The previous prime is 121100133191. The next prime is 121100133221. The reversal of 121100133220 is 22331001121.

It is a junction number, because it is equal to n+sod(n) for n = 121100133194 and 121100133203.

It is not an unprimeable number, because it can be changed into a prime (121100133221) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3068976 + ... + 3108184.

It is an arithmetic number, because the mean of its divisors is an integer number (2939573700).

Almost surely, 2^121100133220 is an apocalyptic number.

121100133220 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 121100133220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (141099537600).

121100133220 is an abundant number, since it is smaller than the sum of its proper divisors (161098941980).

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

121100133220 is a wasteful number, since it uses less digits than its factorization.

121100133220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39469 (or 39467 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 121100133220 its reverse (22331001121), we get a palindrome (143431134341).

The spelling of 121100133220 in words is "one hundred twenty-one billion, one hundred million, one hundred thirty-three thousand, two hundred twenty".