0o21570

0o21570 is an octal literal, written with the 0o prefix used in several modern programming languages to denote base-8 numbers. The digits 2, 1, 5, 7, and 0 are valid in octal notation, which uses the digits 0 through 7 exclusively.

In decimal form, 0o21570 equals 9080. In hexadecimal, it is represented as 0x2378. These base conversions follow the standard base-8 to base-10 and base-16 conversion rules used in computing and mathematics.

Usage and context: the 0o prefix is used in languages such as Python 3, JavaScript (ECMAScript 2015 and later), and Ruby to clearly indicate an octal literal. This contrasts with languages or older syntax that denote octal values with a leading zero or other conventions. Note that in Python 2, octal literals were written with a leading zero (e.g., 021570), whereas Python 3 adopts 0o as the explicit octal indicator to avoid confusion with decimal and other bases.

Applications: octal literals are convenient for representing bit fields and permissions, since each octal digit corresponds to exactly three binary bits. While 0o21570 specifically does not have a widely known canonical meaning on its own, understanding its value illustrates how octal notation maps to decimal and hexadecimal representations in computing.

See also: octal numeral system, numeric literals, base-8 representation, bitwise operations.