Properties of the Number 21148

Twenty-One Thousand One Hundred Forty-Eight

Basics

Value: 21147 → 21148 → 21149

Parity: even

Prime: No

Previous Prime: 21143

Next Prime: 21149

Digit Sum: 16

Digital Root: 7

Palindrome: No

Factorization: 2 ² × 17 × 311

Divisors: 1, 2, 4, 17, 34, 68, 311, 622, 1244, 5287

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101001010011100

Octal: 51234

Duodecimal: 102A4

Hexadecimal: 529c

Square: 447237904

Square Root: 145.42351941828392

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 partitions of n into at most 1 copy of 1, 2 copies of 2, 3 copies of 3, ... . A52335

Number of binary words of length n with all distinct runs. A351016

Sum of quadratic residues of (n-th prime == 3 mod 4). A282035

Triangle read by rows: T(n,k) gives the number of ballot sequences of length n having exactly k descents, n>=0, 0<=k<=n. A238121

Irregular triangle read by rows: T(n,k) gives the number of ballot sequences of length n having k descents, n>=0, 0<=k<=A083920(n-1). A238122

Let p = n-th prime == 7 mod 8; a(n) = sum of quadratic residues mod p. A282041

First of triples of consecutive happy numbers, i.e., the first of three consecutive integers each of which is a happy number (A007770). A72494

First of quadruples of consecutive happy numbers. A194352

Number of ballot sequences of length n having exactly two descents. A241795

Numbers for which the cube of the sum of the digits is equal to the square of the product of their digits. A241846