Base | Representation |
---|---|
bin | 10000111110000011… |
… | …101011111111100111 |
3 | 1202000212001212212101 |
4 | 100332003223333213 |
5 | 244304040220312 |
6 | 12212015432531 |
7 | 1213351066432 |
oct | 207603537747 |
9 | 52025055771 |
10 | 18221023207 |
11 | 7800324472 |
12 | 3646225747 |
13 | 1944c6894a |
14 | c4bd22819 |
15 | 7199b6a57 |
hex | 43e0ebfe7 |
18221023207 has 2 divisors, whose sum is σ = 18221023208. Its totient is φ = 18221023206.
The previous prime is 18221023193. The next prime is 18221023229. The reversal of 18221023207 is 70232012281.
It is a weak prime.
It is a cyclic number.
It is not a de Polignac number, because 18221023207 - 227 = 18086805479 is a prime.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (18221023907) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9110511603 + 9110511604.
It is an arithmetic number, because the mean of its divisors is an integer number (9110511604).
Almost surely, 218221023207 is an apocalyptic number.
18221023207 is a deficient number, since it is larger than the sum of its proper divisors (1).
18221023207 is an equidigital number, since it uses as much as digits as its factorization.
18221023207 is an evil number, because the sum of its binary digits is even.
The product of its (nonzero) digits is 2688, while the sum is 28.
Adding to 18221023207 its reverse (70232012281), we get a palindrome (88453035488).
The spelling of 18221023207 in words is "eighteen billion, two hundred twenty-one million, twenty-three thousand, two hundred seven".
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