Properties of the Number 21274

Twenty-One Thousand Two Hundred Seventy-Four

Basics

Value: 21273 → 21274 → 21275

Parity: even

Prime: No

Previous Prime: 21269

Next Prime: 21277

Digit Sum: 16

Digital Root: 7

Palindrome: No

Factorization: 2 × 11 × 967

Divisors: 1, 2, 11, 22, 967, 1934, 10637, 21274

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101001100011010

Octal: 51432

Duodecimal: 1038A

Hexadecimal: 531a

Square: 452583076

Square Root: 145.85609346201483

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

Stella octangula numbers: a(n) = n*(2·n² - 1). A7588

Poincaré series for invariant polynomial functions on the space of binary forms of degree 9. A293934

Expansion of ∑_k>0 x^2·k/(1-x^k)⁶. A363606

Numbers k such that in k and k² the parity of digits alternates. A30153

a(n) = 2662·n - 22. A157609

a(0) = a(1) = 1. a(n) = a(n-1) + a(n - b(n)), where b(n) is largest prime dividing n. A137809

Sum of the next n nonnegative integers repeated (A004526). A319007

Number of (n+2) X 3 binary arrays with each 3 X 3 subblock having rows and columns in lexicographically nondecreasing order. A184540

Expansion of g.f. 1/((1 - x)*(1 - 2·x)*(1 - 8·x)*(1 - 11·x)). A21274

Number of nX4 0..1 arrays with each 1 adjacent to 2, 3 or 4 king-move neighboring 1s. A296823