Properties of the Number 10921

Ten Thousand Nine Hundred Twenty-One

Basics

Value: 10920 → 10921 → 10922

Parity: odd

Prime: No

Previous Prime: 10909

Next Prime: 10937

Digit Sum: 13

Digital Root: 4

Palindrome: No

Factorization: 67 × 163

Divisors: 1, 67, 163, 10921

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10101010101001

Octal: 25251

Duodecimal: 63A1

Hexadecimal: 2aa9

Square: 119268241

Square Root: 104.50358845513392

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(0) = 0. For n > 0, smallest non-palindromic number k such that the smallest palindrome in the Reverse and Add! trajectory of k is reached after exactly n iterations. A23109

a(n) = ∑_d∣n (n-1)!/(d-1)!. A87906

Heinz numbers of integer partitions with as many even parts as odd parts and as many even conjugate parts as odd conjugate parts. A350946

a(n) = (5 + (-2)ⁿ)/3. A140966

Expansion of x*(1+2·x)/((1+x)*(1-x)*(1-2·x)). A84639

Positions of ones in A264977; positions of twos in A277330. A277701

Nonprime Heinz numbers of multiples of triangular partitions, or of finite arithmetic progressions with offset 0. A325407

a(n) = (8·4ⁿ - 5)/3. A83584

Centered 14-gonal numbers. A69127

T(n,k)=Number of nXk 0..3 arrays with no element equal to one plus the sum of elements to its left or zero plus the sum of the elements above it or zero plus the sum of the elements diagonally to its northwest or one plus the sum of the elements antidiagonally to its northeast, modulo 4. A241054