Base | Representation |
---|---|
bin | 101000000101… |
… | …1000011111111 |
3 | 1110112202200011 |
4 | 1100023003333 |
5 | 20340014311 |
6 | 2030244051 |
7 | 343432363 |
oct | 120130377 |
9 | 43482604 |
10 | 21016831 |
11 | 10955290 |
12 | 7056627 |
13 | 447b1c4 |
14 | 2b112a3 |
15 | 1ca2321 |
hex | 140b0ff |
21016831 has 8 divisors (see below), whose sum is σ = 24134400. Its totient is φ = 18100440.
The previous prime is 21016829. The next prime is 21016837. The reversal of 21016831 is 13861012.
It is a sphenic number, since it is the product of 3 distinct primes.
It is a cyclic number.
It is not a de Polignac number, because 21016831 - 21 = 21016829 is a prime.
It is a super-2 number, since 2×210168312 = 883414370565122, which contains 22 as substring.
It is a Duffinian number.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (21016837) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (13) of ones.
It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50071 + ... + 50488.
It is an arithmetic number, because the mean of its divisors is an integer number (3016800).
Almost surely, 221016831 is an apocalyptic number.
21016831 is a deficient number, since it is larger than the sum of its proper divisors (3117569).
21016831 is a wasteful number, since it uses less digits than its factorization.
21016831 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 100589.
The product of its (nonzero) digits is 288, while the sum is 22.
The square root of 21016831 is about 4584.4117397982. The cubic root of 21016831 is about 275.9661050233.
Adding to 21016831 its reverse (13861012), we get a palindrome (34877843).
The spelling of 21016831 in words is "twenty-one million, sixteen thousand, eight hundred thirty-one".
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