2104

RFC 2104 defines HMAC.

Even
Composite

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Where 2104 fits

2104 connects to 1 world: related numbers.

Why 2104 is special

It exists because the obvious way to authenticate a message with a hash — prepending a key — is broken by length extension, and HMAC's nested construction is not.

Factors & digit properties

Divisors (8): 1, 2, 4, 8, 263, 526, 1052, 2104
Prime factorisation: 2^3 × 263
Digit sum: 7
Digital root: 7

Representations

Decimal: 2104
Binary: 100000111000
Octal: 4070
Hexadecimal: 838
Roman numeral: MMCIV
Scientific notation: 2.104 × 10^3

Other mathematical patterns

Deficient number

Related numbers & connections

Connection

HMAC exists because prepending a key to a hash is broken by length extension, which affects MD5 and SHA-1 alike.

View 1321 →

Other connections

is associated with1321
why?
Strength 0.50, confidence "high".
contrasts with9797
why?
Strength 0.50, confidence "high".
developed from5869
why?
Strength 0.50, confidence "high".
developed from4226
why?
Strength 0.50, confidence "high".

How is 2104 connected to another number? →

Technology & computing

RFC 2104 specifies keyed-hash message authentication using nested inner and outer hashing. The construction resists length extension attacks that affect naive keyed hashing over Merkle-Damgard functions.
DocumentedTechnology & computingGeography: International — IETFPeriod: 1997

Common questions

Is 2104 a prime number?

No, 2104 is not prime.

What are the factors of 2104?

The factors of 2104 are 1, 2, 4, 8, 263, 526, 1052, 2104.

What is 2104 in Roman numerals?

2104 in Roman numerals is MMCIV.

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