Base | Representation |
---|---|
bin | 1110011100101… |
… | …01110110001100 |
3 | 22110001121011100 |
4 | 13032111312030 |
5 | 222011400022 |
6 | 20005423100 |
7 | 3001116543 |
oct | 716256614 |
9 | 273047140 |
10 | 121200012 |
11 | 624613aa |
12 | 3470aa90 |
13 | 1c1571ab |
14 | 1214d15a |
15 | a9911ac |
hex | 7395d8c |
121200012 has 72 divisors (see below), whose sum is σ = 331276400. Its totient is φ = 37231488.
The previous prime is 121200011. The next prime is 121200017. The reversal of 121200012 is 210002121.
It is a Harshad number since it is a multiple of its sum of digits (9).
It is a junction number, because it is equal to n+sod(n) for n = 121199967 and 121200003.
It is not an unprimeable number, because it can be changed into a prime (121200011) 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, 22914 + ... + 27702.
Almost surely, 2121200012 is an apocalyptic number.
121200012 is a gapful number since it is divisible by the number (12) 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 121200012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (165638200).
121200012 is an abundant number, since it is smaller than the sum of its proper divisors (210076388).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
121200012 is a wasteful number, since it uses less digits than its factorization.
121200012 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 4855 (or 4850 counting only the distinct ones).
The product of its (nonzero) digits is 8, while the sum is 9.
The square root of 121200012 is about 11009.0877006226. The cubic root of 121200012 is about 494.8811223560.
Adding to 121200012 its reverse (210002121), we get a palindrome (331202133).
The spelling of 121200012 in words is "one hundred twenty-one million, two hundred thousand, twelve".
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