| Base | Representation |
|---|---|
| bin | 111111001101101… |
| … | …1011110110111100 |
| 3 | 12110211021010021220 |
| 4 | 1332123123312330 |
| 5 | 13321001334322 |
| 6 | 550250553340 |
| 7 | 103364142600 |
| oct | 17633336674 |
| 9 | 5424233256 |
| 10 | 2121121212 |
| 11 | 999354841 |
| 12 | 4b2438850 |
| 13 | 27a5a4712 |
| 14 | 1619c7500 |
| 15 | c633a55c |
| hex | 7e6dbdbc |
2121121212 has 144 divisors (see below), whose sum is σ = 6122511360. Its totient is φ = 567909888.
The previous prime is 2121121207. The next prime is 2121121217. The reversal of 2121121212 is 2121211212.
It is an interprime number because it is at equal distance from previous prime (2121121207) and next prime (2121121217).
It is a nude number because it is divisible by every one of its digits.
It is a junction number, because it is equal to n+sod(n) for n = 2121121191 and 2121121200.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (2121121217) by changing a digit.
It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4427989 + ... + 4428467.
It is an arithmetic number, because the mean of its divisors is an integer number (42517440).
Almost surely, 22121121212 is an apocalyptic number.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 2121121212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3061255680).
2121121212 is an abundant number, since it is smaller than the sum of its proper divisors (4001390148).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
2121121212 is a wasteful number, since it uses less digits than its factorization.
2121121212 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 960 (or 951 counting only the distinct ones).
The product of its digits is 32, while the sum is 15.
The square root of 2121121212 is about 46055.6317077510. The cubic root of 2121121212 is about 1284.8580870497.
Adding to 2121121212 its reverse (2121211212), we get a palindrome (4242332424).
Subtracting 2121121212 from its reverse (2121211212), we obtain a square (90000 = 3002).
The spelling of 2121121212 in words is "two billion, one hundred twenty-one million, one hundred twenty-one thousand, two hundred twelve".
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