| Base | Representation |
|---|---|
| bin | 111000011111010110… |
| … | …1100111110101011000 |
| 3 | 102121010101111001201102 |
| 4 | 1300332231213311120 |
| 5 | 3441421133400240 |
| 6 | 131421332410532 |
| 7 | 11523130311146 |
| oct | 1607655476530 |
| 9 | 377111431642 |
| 10 | 121311231320 |
| 11 | 474a2033674 |
| 12 | 1b616a76a48 |
| 13 | b593a554a6 |
| 14 | 5c2b54c596 |
| 15 | 3250163815 |
| hex | 1c3eb67d58 |
121311231320 has 128 divisors (see below), whose sum is σ = 281715840000. Its totient is φ = 46985702400.
The previous prime is 121311231317. The next prime is 121311231323. The reversal of 121311231320 is 23132113121.
It is a happy number.
It is an interprime number because it is at equal distance from previous prime (121311231317) and next prime (121311231323).
It is a Harshad number since it is a multiple of its sum of digits (20).
It is a junction number, because it is equal to n+sod(n) for n = 121311231292 and 121311231301.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (121311231323) 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, 221775287 + ... + 221775833.
It is an arithmetic number, because the mean of its divisors is an integer number (2200905000).
Almost surely, 2121311231320 is an apocalyptic number.
121311231320 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 121311231320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (140857920000).
121311231320 is an abundant number, since it is smaller than the sum of its proper divisors (160404608680).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
121311231320 is a wasteful number, since it uses less digits than its factorization.
121311231320 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 1369 (or 1365 counting only the distinct ones).
The product of its (nonzero) digits is 216, while the sum is 20.
Adding to 121311231320 its reverse (23132113121), we get a palindrome (144443344441).
The spelling of 121311231320 in words is "one hundred twenty-one billion, three hundred eleven million, two hundred thirty-one thousand, three hundred twenty".
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