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Properties of the Number 21827

Twenty-One Thousand Eight Hundred Twenty-Seven

Basics

Value: 21826 → 21827 → 21828

Parity: odd

Prime: No

Previous Prime: 21821

Next Prime: 21839

Digit Sum: 20

Digital Root: 2

Palindrome: No

Factorization: 13 × 23 × 73

Divisors: 1, 13, 23, 73, 299, 949, 1679, 21827

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101010101000011

Octal: 52503

Duodecimal: 1076B

Hexadecimal: 5543

Square: 476417929

Square Root: 147.73963584630903

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 3 X 3 matrices with nonnegative integer entries and all row sums equal to n, up to row and column permutation. A58389
Numbers that are the sum of eight fourth powers in nine or more ways. A345584
Numbers that are the sum of eight fourth powers in exactly nine ways. A345841
Irregular triangle giving on row n all antiderivatives of A024451(n), for n >= 2. A377992
Decimal representation of the x-axis, from the origin to the right edge, of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 62", based on the 5-celled von Neumann neighborhood. A278667
Composite squarefree numbers n such that p(i)+2 divides n-2, where p(i) are the prime factors of n. A225712
Minimum composite squarefree numbers k such that p(i)+n divides k-n, for n=1, 2, 3, 4,..., where p(i) are the prime factors of k . A227974
Indices of records in A210693. A391871
Non-semiprime composite numbers e such that there is no 0<a<b<c<d<e for which a! * b! * c! * d! * e! is a perfect square. A392333
Numbers k such that k and k-1 both first appear in the same power of 2 (in base 10). A322919