| Base | Representation |
|---|---|
| bin | 100100000111111… |
| … | …0101110101011100 |
| 3 | 10010110210200101012 |
| 4 | 1020033311311130 |
| 5 | 4440300042340 |
| 6 | 320135434352 |
| 7 | 42015532604 |
| oct | 11017656534 |
| 9 | 3113720335 |
| 10 | 1212112220 |
| 11 | 572229940 |
| 12 | 299b259b8 |
| 13 | 164175587 |
| 14 | b6da3c04 |
| 15 | 7162e565 |
| hex | 483f5d5c |
1212112220 has 96 divisors (see below), whose sum is σ = 2943198720. Its totient is φ = 414685440.
The previous prime is 1212112207. The next prime is 1212112229. The reversal of 1212112220 is 222112121.
It is a super-3 number, since 3×12121122203 (a number of 28 digits) contains 333 as substring.
It is a junction number, because it is equal to n+sod(n) for n = 1212112195 and 1212112204.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (1212112229) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (17) of ones.
It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 655337 + ... + 657183.
It is an arithmetic number, because the mean of its divisors is an integer number (30658320).
Almost surely, 21212112220 is an apocalyptic number.
1212112220 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 1212112220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1471599360).
1212112220 is an abundant number, since it is smaller than the sum of its proper divisors (1731086500).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
1212112220 is a wasteful number, since it uses less digits than its factorization.
1212112220 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 2043 (or 2041 counting only the distinct ones).
The product of its (nonzero) digits is 32, while the sum is 14.
The square root of 1212112220 is about 34815.4020513910. The cubic root of 1212112220 is about 1066.2219276593.
Adding to 1212112220 its reverse (222112121), we get a palindrome (1434224341).
Subtracting from 1212112220 its reverse (222112121), we obtain a palindrome (990000099).
The spelling of 1212112220 in words is "one billion, two hundred twelve million, one hundred twelve thousand, two hundred twenty".
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