Base | Representation |
---|---|
bin | 101000000011… |
… | …0111110100001 |
3 | 1110111220201101 |
4 | 1100012332201 |
5 | 20334000342 |
6 | 2030034401 |
7 | 343332526 |
oct | 120067641 |
9 | 43456641 |
10 | 21000097 |
11 | 10943758 |
12 | 7048a01 |
13 | 44736c1 |
14 | 2b0914d |
15 | 1c9c3b7 |
hex | 1406fa1 |
21000097 has 2 divisors, whose sum is σ = 21000098. Its totient is φ = 21000096.
The previous prime is 21000059. The next prime is 21000103. The reversal of 21000097 is 79000012.
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 15124321 + 5875776 = 3889^2 + 2424^2 .
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-21000097 is a prime.
It is a Chen prime.
It is not a weakly prime, because it can be changed into another prime (21000037) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (11) of ones.
It is a good prime.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10500048 + 10500049.
It is an arithmetic number, because the mean of its divisors is an integer number (10500049).
Almost surely, 221000097 is an apocalyptic number.
It is an amenable number.
21000097 is a deficient number, since it is larger than the sum of its proper divisors (1).
21000097 is an equidigital number, since it uses as much as digits as its factorization.
21000097 is an odious number, because the sum of its binary digits is odd.
The product of its (nonzero) digits is 126, while the sum is 19.
The square root of 21000097 is about 4582.5862785113. The cubic root of 21000097 is about 275.8928424242.
The spelling of 21000097 in words is "twenty-one million, ninety-seven", and thus it is an aban number and an uban number.
• e-mail: info -at- numbersaplenty.com • Privacy notice • done in 0.064 sec. • engine limits •