21424

21424 is a natural number that sits between 21423 and 21425. It is an even, composite integer that appears in a variety of mathematical contexts as an example of a non-prime in the 21st century.

Mathematical properties: The prime factorization of 21424 is 2^4 × 13 × 103. This yields 20 positive divisors in total. The divisors are 1, 2, 4, 8, 16, 13, 26, 52, 104, 208, 103, 206, 412, 824, 1339, 1648, 2678, 5356, 10712, and 21424. The number is divisible by 16 but not by 32, reflecting the 2^4 factor in its decomposition. The sum of its digits is 13, giving a digital root of 4.

Representations in different bases: In binary, 21424 is 1010011101100002. In octal it equals 51660, and in hexadecimal it equals 53B0.

Context and usage: Like many integers, 21424 can occur as a label in catalogs, inventories, or geographic or postal systems. There is no widely recognized mathematical constant or famous entity specifically associated with this number, beyond its standard numerical and factorization properties. It serves as a representative example of an even, composite number with a straightforward prime factorization used in number theory and arithmetic demonstrations.

---