1021
CWE-1021 is improper restriction of rendered UI layers.
- Odd
- Prime
Where 1021 fits
Why 1021 is special
Clickjacking is this: the user clicks what they can see and the click lands on something invisible above or below it.
1021 is part of
Factors & digit properties
- Divisors (2)
- 1, 1021
- Prime factorisation
- 1021
- Digit sum
- 4
- Digital root
- 4
Representations
- Decimal
- 1021
- Scientific notation
- 1.021 × 10^3
Roman numerals
M X X I
Binary
1 1 1 1 1 1 1 1 0 1
1 × 512 + 1 × 256 + 1 × 128 + 1 × 64 + 1 × 32 + 1 × 16 + 1 × 8 + 1 × 4 + 0 × 2 + 1 × 1 = 1,021
Octal
1 7 7 5
1 × 512 + 7 × 64 + 7 × 8 + 5 × 1 = 1,021
Hexadecimal
3 f d
3 × 256 + f × 16 + d × 1 = 1,021
Read as powers of two: 512 + 256 + 128 + 64 + 32 + 16 + 8 + 4 + 1 = 1,021.
In historical numeral systems
Egyptian
1 lotus, 2 hobbles, 1 stroke
1 × 1,000 + 2 × 10 + 1 × 1 = 1,021. The signs are simply repeated and added; where they sit on the line is a matter of layout, not value.
Babylonian
1 corner wedge + 7 vertical wedges (sixties place), 1 vertical wedge (units place)
17 × 60 + 1 = 1021. Places are separated by a space on the tablet, with the higher place written first.
Systems that simply cannot reach this value are left out. Where a script needs a font most readers do not have, the reading is given instead of the glyphs — see number systems for each system in full.
Other mathematical patterns
- Deficient number
- Lucky number (mathematical sieve)
- Twin prime
Related numbers & connections
Framing restrictions are the control that the rendered-UI-layer weakness exists for lack of.
View 7034 →Other connections
- is associated with7034
why?
Strength 0.50, confidence "high".
Technology & computing
CWE-1021 covers failure to restrict how a page may be framed or overlaid, allowing a user's interaction to be directed at content they cannot see.
DocumentedTechnology & computingGeography: International — MITRE CWEPeriod: 2006–
Common questions
Is 1021 a prime number?
Yes, 1021 is prime — it has exactly two positive divisors: 1 and itself.
What are the factors of 1021?
The factors of 1021 are 1, 1021.
What is 1021 in Roman numerals?
1021 in Roman numerals is MXXI.
About this page's data
Mathematical facts:computed directly from the number's value — nothing to source or verify externally.
Contextual records: 1 reviewer-confirmed record, sourced and reviewed before publication.
Last reviewed: 15 July 2026