Base | Representation |
---|---|
bin | 111100001110110… |
… | …0010101001000001 |
3 | 12012211212221111200 |
4 | 1320131202221001 |
5 | 13114334304420 |
6 | 532313131413 |
7 | 101040205251 |
oct | 17035425101 |
9 | 5184787450 |
10 | 2021009985 |
11 | 947897795 |
12 | 4849b9b69 |
13 | 2629223c7 |
14 | 1525a7961 |
15 | bc662b90 |
hex | 78762a41 |
2021009985 has 24 divisors (see below), whose sum is σ = 3515062824. Its totient is φ = 1074186240.
The previous prime is 2021009983. The next prime is 2021009987. The reversal of 2021009985 is 5899001202.
It is an interprime number because it is at equal distance from previous prime (2021009983) and next prime (2021009987).
It can be written as a sum of positive squares in 4 ways, for example, as 1315948176 + 705061809 = 36276^2 + 26553^2 .
It is not a de Polignac number, because 2021009985 - 21 = 2021009983 is a prime.
It is not an unprimeable number, because it can be changed into a prime (2021009983) by changing a digit.
It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 63456 + ... + 89825.
It is an arithmetic number, because the mean of its divisors is an integer number (146460951).
Almost surely, 22021009985 is an apocalyptic number.
It is an amenable number.
2021009985 is a deficient number, since it is larger than the sum of its proper divisors (1494052839).
2021009985 is a wasteful number, since it uses less digits than its factorization.
2021009985 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 153585 (or 153582 counting only the distinct ones).
The product of its (nonzero) digits is 12960, while the sum is 36.
The square root of 2021009985 is about 44955.6446400227. The cubic root of 2021009985 is about 1264.3175111085.
The spelling of 2021009985 in words is "two billion, twenty-one million, nine thousand, nine hundred eighty-five".
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