Base | Representation |
---|---|
bin | 101000011100… |
… | …0010001010001 |
3 | 1110220011200022 |
4 | 1100320101101 |
5 | 20411431001 |
6 | 2034233225 |
7 | 345133262 |
oct | 120702121 |
9 | 43804608 |
10 | 21202001 |
11 | 10a71417 |
12 | 7125815 |
13 | 4514582 |
14 | 2b5c969 |
15 | 1cdc11b |
hex | 1438451 |
21202001 has 2 divisors, whose sum is σ = 21202002. Its totient is φ = 21202000.
The previous prime is 21201997. The next prime is 21202003. The reversal of 21202001 is 10020212.
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 21022225 + 179776 = 4585^2 + 424^2 .
It is a cyclic number.
It is not a de Polignac number, because 21202001 - 22 = 21201997 is a prime.
Together with 21202003, it forms a pair of twin primes.
It is a Chen prime.
It is a self number, because there is not a number n which added to its sum of digits gives 21202001.
It is not a weakly prime, because it can be changed into another prime (21202003) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10601000 + 10601001.
It is an arithmetic number, because the mean of its divisors is an integer number (10601001).
Almost surely, 221202001 is an apocalyptic number.
It is an amenable number.
21202001 is a deficient number, since it is larger than the sum of its proper divisors (1).
21202001 is an equidigital number, since it uses as much as digits as its factorization.
21202001 is an odious number, because the sum of its binary digits is odd.
The product of its (nonzero) digits is 8, while the sum is 8.
The square root of 21202001 is about 4604.5630628758. The cubic root of 21202001 is about 276.7742081242.
Adding to 21202001 its reverse (10020212), we get a palindrome (31222213).
The spelling of 21202001 in words is "twenty-one million, two hundred two thousand, one".
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