| Base | Representation |
|---|---|
| bin | 100100001000001… |
| … | …0000101011111000 |
| 3 | 10010111000021020112 |
| 4 | 1020100100223320 |
| 5 | 4440312102300 |
| 6 | 320142043452 |
| 7 | 42016501340 |
| oct | 11020205370 |
| 9 | 3114007215 |
| 10 | 1212222200 |
| 11 | 5722a4532 |
| 12 | 299b79588 |
| 13 | 1641b3657 |
| 14 | b6dd1d20 |
| 15 | 71651e35 |
| hex | 48410af8 |
1212222200 has 96 divisors (see below), whose sum is σ = 3253318560. Its totient is φ = 411456000.
The previous prime is 1212222191. The next prime is 1212222203. The reversal of 1212222200 is 22222121.
It is a Harshad number since it is a multiple of its sum of digits (14).
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (1212222203) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (11) of ones.
It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 137114 + ... + 145686.
It is an arithmetic number, because the mean of its divisors is an integer number (33888735).
Almost surely, 21212222200 is an apocalyptic number.
1212222200 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 1212222200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1626659280).
1212222200 is an abundant number, since it is smaller than the sum of its proper divisors (2041096360).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
1212222200 is a wasteful number, since it uses less digits than its factorization.
1212222200 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 8697 (or 8688 counting only the distinct ones).
The product of its (nonzero) digits is 64, while the sum is 14.
The square root of 1212222200 is about 34816.9814889229. The cubic root of 1212222200 is about 1066.2541742723.
Adding to 1212222200 its reverse (22222121), we get a palindrome (1234444321).
It can be divided in two parts, 12122 and 22200, that multiplied together give a triangular number (269108400 = T23199).
The spelling of 1212222200 in words is "one billion, two hundred twelve million, two hundred twenty-two thousand, two hundred".
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