2101
2101 Adonis was lost for fifty years after discovery.
- Odd
- Composite
Where 2101 fits
Why 2101 is special
It was found in 1936, observed briefly, and not recovered until 1977, which is what happens when an orbit is computed from too few observations.
Factors & digit properties
- Divisors (4)
- 1, 11, 191, 2101
- Prime factorisation
- 11 × 191
- Digit sum
- 4
- Digital root
- 4
Representations
- Decimal
- 2101
- Binary
- 100000110101
- Octal
- 4065
- Hexadecimal
- 835
- Roman numeral
- MMCI
- Scientific notation
- 2.101 × 10^3
Other mathematical patterns
- Deficient number
- Semiprime
Related numbers & connections
Both are early near-Earth discoveries from the 1930s, when short observation arcs routinely lost objects again.
View 1221 →Other connections
- is associated with1221
why?
Strength 0.50, confidence "high".
Science
2101 Adonis was discovered in 1936 and subsequently lost, being recovered only in 1977 after its orbit was recomputed. Early short observation arcs frequently produced such losses.
DocumentedSciencePeriod: 1936–
Common questions
Is 2101 a prime number?
No, 2101 is not prime.
What are the factors of 2101?
The factors of 2101 are 1, 11, 191, 2101.
What is 2101 in Roman numerals?
2101 in Roman numerals is MMCI.
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