Properties of the Number 21976

Twenty-One Thousand Nine Hundred Seventy-Six

Basics

Value: 21975 → 21976 → 21977

Parity: even

Prime: No

Previous Prime: 21961

Next Prime: 21977

Digit Sum: 25

Digital Root: 7

Palindrome: No

Factorization: 2 ³ × 41 × 67

Divisors: 1, 2, 4, 8, 41, 67, 82, 134, 164, 268

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101010111011000

Octal: 52730

Duodecimal: 10874

Hexadecimal: 55d8

Square: 482944576

Square Root: 148.2430436816514

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

T(n,k)=1/4 the number of (n+1)X(k+1) 0..3 arrays with every 2X2 subblock having distinct edge sums. A209736

Numbers k>1 such that k·k^1/k is closer to an integer than for any smaller number. A291211

Number of nX5 0..1 arrays avoiding 0 0 0 and 0 0 1 horizontally and 0 1 0 and 1 1 1 vertically. A208498

1/4 the number of (n+1) X 2 0..3 arrays with every 2 X 2 subblock having distinct edge sums. A209729

1/4 the number of (n+1)X6 0..3 arrays with every 2X2 subblock having distinct edge sums. A209733

Number of partitions satisfying cn(1,5) <= cn(2,5) + cn(3,5) and cn(4,5) <= cn(2,5) + cn(3,5). A39890

T(n,k)=Number of nXk 0..1 arrays avoiding 0 0 0 and 0 0 1 horizontally and 0 1 0 and 1 1 1 vertically. A208501

Least semiprime composed of a square and a positive cube in n different ways. A122956

Decimal expansion of 1/972. A21976