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Properties of the Number 21151

Twenty-One Thousand One Hundred Fifty-One

Basics

Value: 21150 → 21151 → 21152

Parity: odd

Prime: No

Previous Prime: 21149

Next Prime: 21157

Digit Sum: 10

Digital Root: 1

Palindrome: No

Factorization: 13 × 1627

Divisors: 1, 13, 1627, 21151

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101001010011111

Octal: 51237

Duodecimal: 102A7

Hexadecimal: 529f

Square: 447364801

Square Root: 145.43383375267257

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 n X 4 0..1 arrays avoiding 0 0 0 and 0 1 1 horizontally and 0 0 1 and 1 1 0 vertically. A207107
Numerators of continued fraction convergents to sqrt(895). A42730
Semiprimes for which both the sum and the product of the digits is also a semiprime. A118690
Numbers with digital product = 10. A199990
Number of 4-length words w over n-ary alphabet such that for every prefix z of w we have #(z,ai) = 0 or #(z,ai) >= #(z,aj) for all j>i and #(z,ai) counts the occurrences of the i-th letter in z. A213283
Odd composite numbers n, such that n, n+d, n·d and n/d are all odious (A000069) for every divisor d of n. A231558
Semiprimes such that sum of digits equals product of digits. A272436
Least number beginning with n such that every concatenation is a prime. A90506
Composite numbers whose product of digits is 10. A201057
Numbers k such that 7·Rk + 10 is prime, where Rk = 11...1 is the repunit (A002275) of length k. A256906