Properties of the Number 21656

Twenty-One Thousand Six Hundred Fifty-Six

Basics

Value: 21655 → 21656 → 21657

Parity: even

Prime: No

Previous Prime: 21649

Next Prime: 21661

Digit Sum: 20

Digital Root: 2

Palindrome: No

Factorization: 2 ³ × 2707

Divisors: 1, 2, 4, 8, 2707, 5414, 10828, 21656

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101010010011000

Octal: 52230

Duodecimal: 10648

Hexadecimal: 5498

Square: 468982336

Square Root: 147.15977711317723

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

a(1) = 5; a(n+1) = a(n)-th nonprime, where nonprimes begin at 4. A25010

Number of ways of covering a 2n X 2n lattice with 2n² dominoes of which exactly 6 are horizontal (or vertical) dominoes. A54344

Number of idempotent 3 X 3 -n..n matrices. A223455

If n² has an even number of digits, write n after the left half of the digits of n² and before the right half, otherwise if n² has 2t+1 digits, write n after the first t digits of n² and before the last t+1 digits. A274620

1/(1 - Integral_x=0..1 x^xⁿ dx), rounded to the nearest integer. A322008

Decimal expansion of 1/652. A21656