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Properties of the Number 21772

Twenty-One Thousand Seven Hundred Seventy-Two

Basics

Value: 21771 → 21772 → 21773

Parity: even

Prime: No

Previous Prime: 21767

Next Prime: 21773

Digit Sum: 19

Digital Root: 1

Palindrome: No

Factorization: 2 2 × 5443

Divisors: 1, 2, 4, 5443, 10886, 21772

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101010100001100

Octal: 52414

Duodecimal: 10724

Hexadecimal: 550c

Square: 474019984

Square Root: 147.5533801713807

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 nonnegative solutions to (x1)2 + (x2)2 + ... + (x8)2 <= n. A341403
Numbers t which satisfy the equation: t mod k = floor((t - k)/k) mod k (1 <= k <= t) only for k = 1 and t. A375007
Number of 2 X 2 matrices having all terms in {-n,...,0,...,n} and determinant n-1. A211141
Sum of primes in n-th shell of prime spiral. A53997
Positive integers m such that none of the four consecutive numbers m, m+1, m+2, m+3 can be written as p2 + q with p and q both prime. A258661
Number of n X n arrays containing n copies of 0..n-1 with every element equal to or 1 greater than any north or northeast neighbors modulo n and the upper left element equal to 0. A267552
T(n,k)=Number of nXk arrays containing k copies of 0..n-1 with every element equal to or 1 greater than any north or northeast neighbors modulo n and the upper left element equal to 0. A267553
T(n,k)=Number of nXk arrays containing k copies of 0..n-1 with every element equal to or 1 greater than any west or southwest neighbors modulo n and the upper left element equal to 0. A267562
Expansion of 1/((1-x)(1-4x)(1-5x)(1-9x)). A21772