Properties of the Number 21488

Twenty-One Thousand Four Hundred Eighty-Eight

Basics

Value: 21487 → 21488 → 21489

Parity: even

Prime: No

Previous Prime: 21487

Next Prime: 21491

Digit Sum: 23

Digital Root: 5

Palindrome: No

Factorization: 2 ⁴ × 17 × 79

Divisors: 1, 2, 4, 8, 16, 17, 34, 68, 79, 136

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101001111110000

Octal: 51760

Duodecimal: 10528

Hexadecimal: 53f0

Square: 461734144

Square Root: 146.58785761446956

Classification

Fibonacci: No

Bell Number: No

Factorial Number: No

Regular Number: No

Perfect Number: No

Special

Kaprekar Constant: No

Munchausen Constant: No

Armstrong Number: No

Kaprekar Number: No

Catalan Number: No

Vampire Number: No

Taxicab Number: No

Super Prime: No

Friedman Number: No

Fermat Number: No

Cullen Number: No

OEIS Sequences

Number A(n,k) of sets of nonempty words with a total of n letters over k-ary alphabet; square array A(n,k), n>=0, k>=0, read by antidiagonals. A292804

Numbers which are representable as a sum of seventeen but no fewer consecutive nonnegative integers. A270302

Number of sets of nonempty words with a total of n letters over quaternary alphabet. A292838

Denominators of continued fraction convergents to sqrt(719). A42385

Indices of the start of 10 successive distinct digits in the decimal expansion of e (2.718281828...). A258166

Total Wiener index of double-star trees with n nodes. A186235

Number of permutations of length n containing exactly 2 occurrences of 123 and 2 occurrences of 132. A224288

Let s(k) denote the sum of the even proper divisors of k. The sequence lists the pairs of numbers (x, y) such that s(x) = y and s(y) = x. A279812

List of ordered pairs (x, y) from A279812. A279950

Alternating sum of the numbers in the trajectory of n for the 3x+1 problem. A386437