| Base | Representation |
|---|---|
| bin | 10001100111110101111… |
| … | …100001101100010111100 |
| 3 | 11021202211111202021212220 |
| 4 | 101213311330031202330 |
| 5 | 124320123033342340 |
| 6 | 2324155314125340 |
| 7 | 153331002155643 |
| oct | 21476574154274 |
| 9 | 4252744667786 |
| 10 | 1211012012220 |
| 11 | 42765078993a |
| 12 | 176851580850 |
| 13 | 8a275b59a7a |
| 14 | 42882c4435a |
| 15 | 2177b84ded0 |
| hex | 119f5f0d8bc |
1211012012220 has 192 divisors, whose sum is σ = 3523559424000. Its totient is φ = 310441248000.
The previous prime is 1211012012207. The next prime is 1211012012233. The reversal of 1211012012220 is 222102101121.
It is an interprime number because it is at equal distance from previous prime (1211012012207) and next prime (1211012012233).
It is a super-2 number, since 2×12110120122202 (a number of 25 digits) contains 22 as substring.
It is a Harshad number since it is a multiple of its sum of digits (15).
It is a self number, because there is not a number n which added to its sum of digits gives 1211012012220.
It is a congruent number.
It is an unprimeable number.
It is a pernicious number, because its binary representation contains a prime number (23) of ones.
It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 206972295 + ... + 206978145.
It is an arithmetic number, because the mean of its divisors is an integer number (18351872000).
Almost surely, 21211012012220 is an apocalyptic number.
1211012012220 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 1211012012220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1761779712000).
1211012012220 is an abundant number, since it is smaller than the sum of its proper divisors (2312547411780).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
1211012012220 is a wasteful number, since it uses less digits than its factorization.
1211012012220 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 6616 (or 6614 counting only the distinct ones).
The product of its (nonzero) digits is 32, while the sum is 15.
Adding to 1211012012220 its reverse (222102101121), we get a palindrome (1433114113341).
The spelling of 1211012012220 in words is "one trillion, two hundred eleven billion, twelve million, twelve thousand, two hundred twenty".
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