Properties of the Number 21954

Twenty-One Thousand Nine Hundred Fifty-Four

Basics

Value: 21953 → 21954 → 21955

Parity: even

Prime: No

Previous Prime: 21943

Next Prime: 21961

Digit Sum: 21

Digital Root: 3

Palindrome: No

Factorization: 2 × 3 × 3659

Divisors: 1, 2, 3, 6, 3659, 7318, 10977, 21954

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 101010111000010

Octal: 52702

Duodecimal: 10856

Hexadecimal: 55c2

Square: 481978116

Square Root: 148.16882263148344

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) = n³ + 2. A84380

Write n as ∏_i=1..k prime(i)^e_i, where prime(i) is the i-th prime number and e_i is a nonnegative integer. a(n) = ∑_i=1..k e_i*n^i-1. A90883

Number of maximal subsets of {1..n} containing no differences or quotients of pairs of distinct elements. A326491

Numbers that are the sum of five fourth powers in three or more ways. A344243

Numbers that are the sum of five fourth powers in exactly three ways. A344244

a(n) = ∑_i=0..n ∑_j=0..n (i XOR j), where XOR is the binary logical exclusive-or operator. A224923

a(n) = (n-1)*(n-2)*(n-3) + n. A34324

Number of 3Xn arrays containing n copies of 0..3-1 with no element 1 greater than its north, southwest or northwest neighbor modulo 3 and the upper left element equal to 0. A266879

a(0) = 1, a(n) = 28·n² + 2 for n>0. A10018

Numbers n such that n/6 and prime(n)+/-n are all primes. A105550