Properties of the Number 21478

Twenty-One Thousand Four Hundred Seventy-Eight

Basics

Value: 21477 → 21478 → 21479

Parity: even

Prime: No

Previous Prime: 21467

Next Prime: 21481

Digit Sum: 22

Digital Root: 4

Palindrome: No

Factorization: 2 × 10739

Divisors: 1, 2, 10739, 21478

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 101001111100110

Octal: 51746

Duodecimal: 1051A

Hexadecimal: 53e6

Square: 461304484

Square Root: 146.5537444079816

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

Sum of largest parts (counted with multiplicity) of all partitions of n into odd parts. A92310

Numbers that are the sum of eight fourth powers in exactly eight ways. A345840

Volume of the Johnson square pyramid (rounded down) with all the edge lengths equal to n. A229063

a(n) = 168·2ⁿ - 26 (n>=1). A304384

Number of tilings of a 5 X n rectangle using n pentominoes of shapes T, W, I, X. A372221

Number of 4-step S, NW and NE-moving king's tours on an n X n board summed over all starting positions. A187378

a(n) = s(1)s(n) + s(2)s(n-1) + ... + s(k)s(n+1-k), where k = [ (n+1)/2 ], s = (composite numbers). A24588

Number of permutations of length n which avoid the patterns 1234, 4312. A116705

Decimal expansion of 1/474. A21478