Base | Representation |
---|---|
bin | 101000001101… |
… | …1001101010001 |
3 | 1110200010101102 |
4 | 1100123031101 |
5 | 20344123321 |
6 | 2031514145 |
7 | 344126234 |
oct | 120331521 |
9 | 43603342 |
10 | 21082961 |
11 | 1099aa39 |
12 | 7088955 |
13 | 44a2333 |
14 | 2b2b41b |
15 | 1cb6c0b |
hex | 141b351 |
21082961 has 2 divisors, whose sum is σ = 21082962. Its totient is φ = 21082960.
The previous prime is 21082949. The next prime is 21082981. The reversal of 21082961 is 16928012.
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 13690000 + 7392961 = 3700^2 + 2719^2 .
It is a cyclic number.
It is not a de Polignac number, because 21082961 - 218 = 20820817 is a prime.
It is a Chen prime.
It is not a weakly prime, because it can be changed into another prime (21082981) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (11) of ones.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10541480 + 10541481.
It is an arithmetic number, because the mean of its divisors is an integer number (10541481).
Almost surely, 221082961 is an apocalyptic number.
It is an amenable number.
21082961 is a deficient number, since it is larger than the sum of its proper divisors (1).
21082961 is an equidigital number, since it uses as much as digits as its factorization.
21082961 is an odious number, because the sum of its binary digits is odd.
The product of its (nonzero) digits is 1728, while the sum is 29.
The square root of 21082961 is about 4591.6185599416. The cubic root of 21082961 is about 276.2552467899.
The spelling of 21082961 in words is "twenty-one million, eighty-two thousand, nine hundred sixty-one".
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