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
- Binary
- 11010101
- Octal
- 325
- Hexadecimal
- d5
- Roman numeral
- CCXIII
- Scientific notation
- 2.130 × 10^2
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: 3 August 2026