Properties of the Number 21061

Twenty-One Thousand Sixty-One

Basics

Value: 21060 → 21061 → 21062

Parity: odd

Prime: Yes

Previous Prime: 21059

Next Prime: 21067

Digit Sum: 10

Digital Root: 1

Palindrome: No

Factorization: 21061

Divisors: 1, 21061

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 101001001000101

Octal: 51105

Duodecimal: 10231

Hexadecimal: 5245

Square: 443565721

Square Root: 145.1240848377691

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(n) is the solution to the postage stamp problem with 4 denominations and n stamps. A1209

Number of integer partitions of n with a unique composite part. A379302

Primes p for which exactly five bases b with 1 < b < p exist such that p is a base b Wieferich prime. A255208

Primes obtained from other primes by pre-concatenating with 2. A165243

Primitive prime factors of the cyclotomic polynomial sequence φ(9,k) in the order in which they occur. A256144

Primes p such that x⁹ = 2 has a solution mod p, but x^9² = 2 has no solution mod p. A70185

Sums of the form (twin primes + 1) which are also an upper twin prime. A158870

The least number s having exactly n fours in the continued fraction of sqrt(s). A206584

Numerator of ∑_k=1..n(-1)^k/φ(k), where φ = A000010. A211177

Primes p such that x²⁷ = 2 has no solution mod p, but x⁹ = 2 has a solution mod p. A59354