Properties of the Number 21423

Twenty-One Thousand Four Hundred Twenty-Three

Basics

Value: 21422 → 21423 → 21424

Parity: odd

Prime: No

Previous Prime: 21419

Next Prime: 21433

Digit Sum: 12

Digital Root: 3

Palindrome: No

Factorization: 3 × 37 × 193

Divisors: 1, 3, 37, 111, 193, 579, 7141, 21423

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 101001110101111

Octal: 51657

Duodecimal: 10493

Hexadecimal: 53af

Square: 458944929

Square Root: 146.3659796537433

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 of integer partitions of n whose run-lengths are neither weakly increasing nor weakly decreasing. A332641

Number of lone-child-avoiding locally disjoint unlabeled rooted trees with n vertices. A331680

Numbers n such that (n+j) mod (2+j) = 1 for j from 0 to 5 and (n+6) mod 8 <> 1. A96024

Number of partitions p of n such that median(p) > mean(p). A240220

a(n) = A352682(n, n). A352684

Number of partitions of n+6 with largest inscribed rectangle having area <= n. A218627

Numbers m such that φ(m) = k*φ(m-k) for some number 1 <= k < m - 2. A266267

Numbers whose Euler totient function is equal to the product of the number of divisors of their k first powers, for some k. A283759

Starting positions of strings of three 7's in the decimal expansion of π. A83631

a(n) = (2·n+1)!! * ∑_k=0..n k/(2·k+1). A334000