| Base 10 | 21 (2 digits) | ||
| Digit Sum: 3 | Digital Root: 3 | sad | |
| Base 2 | 0b10101 (5 digits) | ||
| Digit Sum: 0b11 | Digital Root: 0b1 | always happy | |
| Base 8 | 025 (2 digits) | ||
| Digit Sum: 07 | Digital Root: 07 | sad | |
| Base 16 | 0x15 (2 digits) | ||
| Digit Sum: 0x6 | Digital Root: 0x6 | sad | |
More about this number at Positiv Integers and Number Empire.
The number is not a prime.
Its 2 (2 unique) factors are:
3
7
Its 4 divisors are:
1
3
7
21
Its aliquote sum is:
11
makeing it a
deficient
number.
| In HTML this number represents this color: |
⇧↑⇧↑⇧↑ #000015 ⇩↓⇩↓⇩↓ |
In the work of Johann Sebastian Bach BWV 21 is Ich hatte viel Bekümmernis [Köthener Fassung in d]
The number appears at position 93 of the decimal digits of π surrounded by
286208998628034825342117067982148086513282 Source: The Pi-Search Page
Computations done with Math::BigInt 1.999811 and Math::Pari 2.030523 based on PARI/GP 2.11.3 (elapsed: 549.87ms; cpu: 81.3499999999996ms)