213
+213 is the international calling code for Algeria.
- Odd
- Composite
Where 213 fits
Why 213 is special
Algeria is the largest country in Africa by area, and its code sits in the 21x North African range alongside Morocco at +212 and Tunisia at +216.
Factors & digit properties
- Divisors (4)
- 1, 3, 71, 213
- Prime factorisation
- 3 × 71
- Digit sum
- 6
- Digital root
- 6
Representations
- Decimal
- 213
- Scientific notation
- 2.130 × 10^2
Roman numerals
C C X I I I
Binary
1 1 0 1 0 1 0 1
1 × 128 + 1 × 64 + 0 × 32 + 1 × 16 + 0 × 8 + 1 × 4 + 0 × 2 + 1 × 1 = 213
Octal
3 2 5
3 × 64 + 2 × 8 + 5 × 1 = 213
Hexadecimal
d 5
d × 16 + 5 × 1 = 213
Read as powers of two: 128 + 64 + 16 + 4 + 1 = 213.
In historical numeral systems
Egyptian
2 coils of rope, 1 hobble, 3 strokes
2 × 100 + 1 × 10 + 3 × 1 = 213. The signs are simply repeated and added; where they sit on the line is a matter of layout, not value.
Babylonian
3 vertical wedges (sixties place), 3 corner wedges + 3 vertical wedges (units place)
3 × 60 + 33 = 213. Places are separated by a space on the tablet, with the higher place written first.
Greek (Ionic)
sigma, then iota, then gamma, marked as a numeral
sigma-iota-gamma + keraia
sigma + iota + gamma written in descending order and added — the letters carry their values wherever they stand, so this is addition, not place value.
Hebrew numerals
resh, then yod, then gimel
resh-yod-gimel
resh (200) + yod (10) + gimel (3) = 213, written in descending order.
Maya
2 bars (upper, twenties place) over 2 bars + 3 dots (lower, units place)
10 × 20 + 13 = 213. Places stack vertically with the smallest at the bottom, so the upper group is worth twenty times the lower.
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
- Semiprime
Related numbers & connections
Consecutive North African calling codes — Morocco, Algeria, Tunisia at +216 and Libya at +218 occupy a contiguous run of the 21x range.
View 212 →Numbers Around Us
- appears alongside212
why?
Strength 0.50, confidence "high".
Geography
+213 reaches Algeria, the largest country in Africa by area, in the 21x range shared with Morocco at +212, Tunisia at +216 and Libya at +218.
DocumentedGeographyGeography: Algeria
Common questions
Is 213 a prime number?
No, 213 is not prime.
What are the factors of 213?
The factors of 213 are 1, 3, 71, 213.
What is 213 in Roman numerals?
213 in Roman numerals is CCXIII.
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