Properties of the Number 21755

Twenty-One Thousand Seven Hundred Fifty-Five

Basics

Value: 21754 → 21755 → 21756

Parity: odd

Prime: No

Previous Prime: 21751

Next Prime: 21757

Digit Sum: 20

Digital Root: 2

Palindrome: No

Factorization: 5 × 19 × 229

Divisors: 1, 5, 19, 95, 229, 1145, 4351, 21755

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101010011111011

Octal: 52373

Duodecimal: 1070B

Hexadecimal: 54fb

Square: 473280025

Square Root: 147.49576265099958

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(n) = A000217(A000217(n))-n². A86602

Integers of the form 4n+3 for which ∑_i=1..u J(i,4n+3) obtains value zero exactly 7 times, when u ranges from 1 to (4n+3). Here J(i,k) is the Jacobi symbol. A166057

Number of 5-ascent sequences of length n that avoid the pattern 00. A261383

Number of balanced numbers > 2^n-1 and <= 2ⁿ. A78555

Numbers n such that n² = 37·m² + 37·m +1. A105843

Consecutive states of the linear congruential pseudo-random number generator (1255·s + 6173) mod 29282 when started at s=1. A385339

Primes containing only two distinct digits whose sum of digits is 28, the second perfect number. A48518

Decimal expansion of 1/751. A21755