| Base | Representation |
|---|---|
| bin | 10001110001010000100… |
| … | …011001011101001110000 |
| 3 | 11022201221002200120200001 |
| 4 | 101301100203023221300 |
| 5 | 130001324230041422 |
| 6 | 2332550432435344 |
| 7 | 154136354456560 |
| oct | 21612043135160 |
| 9 | 4281832616601 |
| 10 | 1221122112112 |
| 11 | 4309696635a1 |
| 12 | 1787b33a8b54 |
| 13 | 8b1c75b5bb6 |
| 14 | 43161866da0 |
| 15 | 21b6e209227 |
| hex | 11c508cba70 |
1221122112112 has 160 divisors (see below), whose sum is σ = 2971444101120. Its totient is φ = 474002876160.
The previous prime is 1221122112097. The next prime is 1221122112121. The reversal of 1221122112112 is 2112112211221.
It is a happy number.
It is a super-2 number, since 2×12211221121122 (a number of 25 digits) contains 22 as substring.
It is a Harshad number since it is a multiple of its sum of digits (19).
It is a nude number because it is divisible by every one of its digits.
It is a self number, because there is not a number n which added to its sum of digits gives 1221122112112.
It is a congruent number.
It is an unprimeable number.
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, 124459687 + ... + 124469497.
It is an arithmetic number, because the mean of its divisors is an integer number (18571525632).
Almost surely, 21221122112112 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 1221122112112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1485722050560).
1221122112112 is an abundant number, since it is smaller than the sum of its proper divisors (1750321989008).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
1221122112112 is a wasteful number, since it uses less digits than its factorization.
1221122112112 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 12411 (or 12405 counting only the distinct ones).
The product of its digits is 64, while the sum is 19.
Adding to 1221122112112 its reverse (2112112211221), we get a palindrome (3333234323333).
The spelling of 1221122112112 in words is "one trillion, two hundred twenty-one billion, one hundred twenty-two million, one hundred twelve thousand, one hundred twelve".
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