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Properties of the Number 21949

Twenty-One Thousand Nine Hundred Forty-Nine

Basics

Value: 21948 → 21949 → 21950

Parity: odd

Prime: No

Previous Prime: 21943

Next Prime: 21961

Digit Sum: 25

Digital Root: 7

Palindrome: No

Factorization: 47 × 467

Divisors: 1, 47, 467, 21949

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: Yes

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101010110111101

Octal: 52675

Duodecimal: 10851

Hexadecimal: 55bd

Square: 481758601

Square Root: 148.15194902531658

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

Composite and every divisor (except 1) contains the digit 4. A62670
T(n,k)=Number of nXk 0..1 arrays with every element equal to 1, 2, 3 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. A302670
Number of partitions of n such that m(2) > m(3), where m = multiplicity. A240065
Heptagonal numbers (A000566) that are semiprimes (A001358). A259676
Heptagonal numbers for which the digital root is also a heptagonal number. A117663
Number of nX4 0..1 arrays with every element equal to 1, 2, 3 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. A302666
Number of 6Xn 0..1 arrays with every element equal to 1, 2, 3 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. A302672
Semiprimes k such that k+4, k+6, k+9, k+10 and k+14 are also semiprimes. A360666
Numbers k such that k + 4, k + 6, k + 9, k + 10, and k + 14 are all semiprimes, where 4, 6, 9, 10, 14 are the first 5 semiprimes. A365240
Multiplicity of highest weight (or singular) vectors associated with character chi142 of Monster module. A34530