Properties of the Number 21553

Twenty-One Thousand Five Hundred Fifty-Three

Basics

Value: 21552 → 21553 → 21554

Parity: odd

Prime: No

Previous Prime: 21529

Next Prime: 21557

Digit Sum: 16

Digital Root: 7

Palindrome: No

Factorization: 7 × 3079

Divisors: 1, 7, 3079, 21553

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101010000110001

Octal: 52061

Duodecimal: 10581

Hexadecimal: 5431

Square: 464531809

Square Root: 146.8094002439898

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) = 2·a(n-1) - a(n-3) + 2·a(floor(n/2)) + 3·a(floor(n/3)) + ... + n·a(floor(n/n)), where a(0) = 1, a(1) = 1, a(2) = 1. A298408

Triangle read by rows: Number of oriented graphs on n nodes with k components. A281446

Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 86 ones. A31854

Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 427", based on the 5-celled von Neumann neighborhood. A271904

Starting term of the smallest n-chain of numbers whose squares are permutations of the same digits. A85546

Number of (n+2)X(2+2) 0..1 arrays with every 3X3 subblock sum of the two medians of the central row and the central column and the two maximums of the diagonal and antidiagonal nondecreasing horizontally and vertically. A254355

Number of (2+2)X(n+2) 0..1 arrays with every 3X3 subblock sum of the two medians of the central row and the central column and the two maximums of the diagonal and antidiagonal nondecreasing horizontally, vertically and ne-to-sw antidiagonally. A254587

Decimal expansion of 1/549. A21553