Base | Representation |
---|---|
bin | 10011100110011010… |
… | …110001100000011111 |
3 | 2000022201002122210220 |
4 | 103212122301200133 |
5 | 321100141204031 |
6 | 13400201132423 |
7 | 1343350023366 |
oct | 234632614037 |
9 | 60281078726 |
10 | 21045647391 |
11 | 8a1a7a041a |
12 | 40b418a113 |
13 | 1ca5207cc2 |
14 | 10391167dd |
15 | 832967596 |
hex | 4e66b181f |
21045647391 has 12 divisors (see below), whose sum is σ = 29061848712. Its totient is φ = 13546621984.
The previous prime is 21045647387. The next prime is 21045647417. The reversal of 21045647391 is 19374654012.
It is not a de Polignac number, because 21045647391 - 22 = 21045647387 is a prime.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (21045647191) by changing a digit.
It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4168236 + ... + 4173281.
It is an arithmetic number, because the mean of its divisors is an integer number (2421820726).
Almost surely, 221045647391 is an apocalyptic number.
21045647391 is a deficient number, since it is larger than the sum of its proper divisors (8016201321).
21045647391 is an equidigital number, since it uses as much as digits as its factorization.
21045647391 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 8341578 (or 8341549 counting only the distinct ones).
The product of its (nonzero) digits is 181440, while the sum is 42.
The spelling of 21045647391 in words is "twenty-one billion, forty-five million, six hundred forty-seven thousand, three hundred ninety-one".
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