Properties of the Number 21410

Twenty-One Thousand Four Hundred Ten

Basics

Value: 21409 → 21410 → 21411

Parity: even

Prime: No

Previous Prime: 21407

Next Prime: 21419

Digit Sum: 8

Digital Root: 8

Palindrome: No

Factorization: 2 × 5 × 2141

Divisors: 1, 2, 5, 10, 2141, 4282, 10705, 21410

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 101001110100010

Octal: 51642

Duodecimal: 10482

Hexadecimal: 53a2

Square: 458388100

Square Root: 146.32156368765337

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

Numbers k such that σ(k+2) = σ(k). A7373

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

Irregular table read by rows: T(n,k) is the number of k-gons, k>=3, in a regular drawing of a complete bipartite graph where the vertex positions on each part equal the Farey series of order n. A359694

a(0)=4, a(1)=0, a(2)=0, a(3)=3; thereafter a(n) = a(n-3) + a(n-4). A50443

a(n) = C(2n-1,n-1) mod n³. A99907

Matrix inverse of triangle A107862. A107865

T(n,k)=Number of (n+1)X(k+1) 0..3 arrays with the maximum plus the upper median minus the minimum of every 2X2 subblock differing from its horizontal and vertical neighbors by exactly one. A237904

Indices n such that A134204(n) < n. A133242

a(n) = binomial(2·c-1, c-1) (mod c³), where c is the n-th composite. A244214