| Base | Representation |
|---|---|
| bin | 111000011111000011… |
| … | …0101101100100110100 |
| 3 | 102121002200021211210221 |
| 4 | 1300332012231210310 |
| 5 | 3441411030444340 |
| 6 | 131420330024124 |
| 7 | 11522644516225 |
| oct | 1607606554464 |
| 9 | 377080254727 |
| 10 | 121301031220 |
| 11 | 474972a7136 |
| 12 | 1b613578044 |
| 13 | b5918c3825 |
| 14 | 5c2a05524c |
| 15 | 324e2eb44a |
| hex | 1c3e1ad934 |
121301031220 has 96 divisors (see below), whose sum is σ = 265076491680. Its totient is φ = 46570782720.
The previous prime is 121301031199. The next prime is 121301031227. The reversal of 121301031220 is 22130103121.
It can be written as a sum of positive squares in 16 ways, for example, as 33255899044 + 88045132176 = 182362^2 + 296724^2 .
It is a junction number, because it is equal to n+sod(n) for n = 121301031194 and 121301031203.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (121301031227) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (19) of ones.
It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 137685180 + ... + 137686060.
It is an arithmetic number, because the mean of its divisors is an integer number (2761213455).
Almost surely, 2121301031220 is an apocalyptic number.
121301031220 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 121301031220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (132538245840).
121301031220 is an abundant number, since it is smaller than the sum of its proper divisors (143775460460).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
121301031220 is a wasteful number, since it uses less digits than its factorization.
121301031220 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 2053 (or 2051 counting only the distinct ones).
The product of its (nonzero) digits is 72, while the sum is 16.
Adding to 121301031220 its reverse (22130103121), we get a palindrome (143431134341).
The spelling of 121301031220 in words is "one hundred twenty-one billion, three hundred one million, thirty-one thousand, two hundred twenty".
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