Base | Representation |
---|---|
bin | 100100010110111… |
… | …1110100010111101 |
3 | 10011000200001010211 |
4 | 1020231332202331 |
5 | 4444310342341 |
6 | 321021032421 |
7 | 42142634641 |
oct | 11055764275 |
9 | 3130601124 |
10 | 1220012221 |
11 | 57673526a |
12 | 2a06b5711 |
13 | 1659b032c |
14 | b805cc21 |
15 | 72190181 |
hex | 48b7e8bd |
1220012221 has 2 divisors, whose sum is σ = 1220012222. Its totient is φ = 1220012220.
The previous prime is 1220012203. The next prime is 1220012273. The reversal of 1220012221 is 1222100221.
It is a happy number.
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 1146567321 + 73444900 = 33861^2 + 8570^2 .
It is an emirp because it is prime and its reverse (1222100221) is a distict prime.
It is a cyclic number.
It is not a de Polignac number, because 1220012221 - 27 = 1220012093 is a prime.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (1220012291) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610006110 + 610006111.
It is an arithmetic number, because the mean of its divisors is an integer number (610006111).
Almost surely, 21220012221 is an apocalyptic number.
It is an amenable number.
1220012221 is a deficient number, since it is larger than the sum of its proper divisors (1).
1220012221 is an equidigital number, since it uses as much as digits as its factorization.
1220012221 is an evil number, because the sum of its binary digits is even.
The product of its (nonzero) digits is 32, while the sum is 13.
The square root of 1220012221 is about 34928.6733358139. The cubic root of 1220012221 is about 1068.5332980336.
Adding to 1220012221 its reverse (1222100221), we get a palindrome (2442112442).
The spelling of 1220012221 in words is "one billion, two hundred twenty million, twelve thousand, two hundred twenty-one".
• e-mail: info -at- numbersaplenty.com • Privacy notice • done in 0.067 sec. • engine limits •