Properties of the Number 21149

Twenty-One Thousand One Hundred Forty-Nine

Basics

Value: 21148 → 21149 → 21150

Parity: odd

Prime: Yes

Previous Prime: 21143

Next Prime: 21157

Digit Sum: 17

Digital Root: 8

Palindrome: No

Factorization: 21149

Divisors: 1, 21149

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 101001010011101

Octal: 51235

Duodecimal: 102A5

Hexadecimal: 529d

Square: 447280201

Square Root: 145.4269576110289

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

Prime number spiral (clockwise, West spoke). A54570

Numbers b > 1 such that the smallest four primes, i.e., 2, 3, 5 and 7 are base-b Wieferich primes. A339533

Primes and their indices such that when their respective SOD's are both prime, the SOD of the index is the nextprime of the prime SOD. A117458

First of triples of consecutive happy numbers, i.e., the first of three consecutive integers each of which is a happy number (A007770). A72494

Primes p such that p·q-p-q and p·q+p+q are prime where q=nextprime(p). A128548

a(n) = 11 + floor(∑_j-1..n-1 a(j)/4). A120168

Numbers N such that N + the sum of the cubes of its digits is again a third power. A362953

Number of free hexagonal polygons of symmetry class D_2h and area n. A121211

Primes which are the sum of two numbers of the form k*(k+1)²/2. A210646

Number of compositions (ordered partitions) of n into distinct parts having a common factor > 1 with n. A332003