Base | Representation |
---|---|
bin | 11001001001111… |
… | …00011010010100 |
3 | 112201001110222101 |
4 | 30210330122110 |
5 | 413004324340 |
6 | 32534411444 |
7 | 5141365030 |
oct | 1444743224 |
9 | 481043871 |
10 | 211011220 |
11 | a9123942 |
12 | 5a800b84 |
13 | 34941214 |
14 | 2004b1c0 |
15 | 137d1c9a |
hex | c93c694 |
211011220 has 48 divisors (see below), whose sum is σ = 511475328. Its totient is φ = 71625600.
The previous prime is 211011217. The next prime is 211011233. The reversal of 211011220 is 22110112.
It is a Harshad number since it is a multiple of its sum of digits (10).
It is a junction number, because it is equal to n+sod(n) for n = 211011197 and 211011206.
It is a congruent number.
It is an unprimeable number.
It is a pernicious number, because its binary representation contains a prime number (13) of ones.
It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6679 + ... + 21601.
It is an arithmetic number, because the mean of its divisors is an integer number (10655736).
Almost surely, 2211011220 is an apocalyptic number.
211011220 is a gapful number since it is divisible by the number (20) 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 211011220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (255737664).
211011220 is an abundant number, since it is smaller than the sum of its proper divisors (300464108).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
211011220 is a wasteful number, since it uses less digits than its factorization.
211011220 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 15040 (or 15038 counting only the distinct ones).
The product of its (nonzero) digits is 8, while the sum is 10.
The square root of 211011220 is about 14526.2252495271. The cubic root of 211011220 is about 595.3447334958.
Adding to 211011220 its reverse (22110112), we get a palindrome (233121332).
The spelling of 211011220 in words is "two hundred eleven million, eleven thousand, two hundred twenty".
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