Properties of the Number 21049

Twenty-One Thousand Forty-Nine

Basics

Value: 21048 → 21049 → 21050

Parity: odd

Prime: No

Previous Prime: 21031

Next Prime: 21059

Digit Sum: 16

Digital Root: 7

Palindrome: No

Factorization: 7 × 31 × 97

Divisors: 1, 7, 31, 97, 217, 679, 3007, 21049

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 101001000111001

Octal: 51071

Duodecimal: 10221

Hexadecimal: 5239

Square: 443060401

Square Root: 145.08273501695507

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 multisets whose right half (inclusive) sums to n. A360671

Pseudoprimes to base 6. A5937

Euler pseudoprimes to base 6: composite integers such that abs(6^{(n - 1}/2)) == 1 mod n. A262053

a(n) = dot_product(1,2,...,n)*(7,8,...,n,1,2,3,4,5,6). A26049

Number of ways to write n as an ordered sum of seven positive Fibonacci numbers (with a single type of 1). A357694

Expansion of g²/(1 + x³*g), where g = 1+x·g³ is the g.f. of A001764. A391296

Products of three distinct happy primes A035497. A154717

Smallest k>0 such that (5ⁿ-k)*5ⁿ-1 and (5ⁿ-k)*5ⁿ+1 are a twin prime pair or 0 if no such k exists. A212488

Triangle t(n,k) read by rows: fibonomial ratios c(n)/(c(k)*c(n-k)) where c are partial products of a generalized Fibonacci sequence with multiplier m=3. A172347

Fibonacci sequence beginning 10, 7. A190996