Properties of the Number 21337

Twenty-One Thousand Three Hundred Thirty-Seven

Basics

Value: 21336 → 21337 → 21338

Parity: odd

Prime: No

Previous Prime: 21323

Next Prime: 21341

Digit Sum: 16

Digital Root: 7

Palindrome: No

Factorization: 19 × 1123

Divisors: 1, 19, 1123, 21337

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101001101011001

Octal: 51531

Duodecimal: 10421

Hexadecimal: 5359

Square: 455267569

Square Root: 146.0719001040241

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

Semiprimes in A056109. A113528

Fundamental discriminants d uniquely characterizing all complex biquadratic fields Q(sqrt(-3),sqrt(d)) which have 3-class group of type (3,3) and second 3-class group isomorphic to SmallGroup(729,34). A250241

Numbers of the form HMMSS with primes H < 24 and MM, SS < 60, for which the number of seconds after midnight, 3600·H+60·MM+SS, is also prime. A295011

Near Cullen numbers: k such that (k+1)*2^k + 1 is prime. A29544

Consecutive states of the linear congruential pseudo-random number generator 20403·s mod 2¹⁵ when started at s=1. A384196

Fibonacci sequence beginning 1, 21. A22391

Total number of parts of multiplicity 9 in all partitions of n. A222709

a(n) = A128020(n)/n. A128021

Numbers n such that n = concat(a,b) and n = φ(n) + φ(a) + φ(b), with a>0 and b>0, where φ(n) is the Euler totient function of n. A258319

a(n) = 12·n² + 4·n + 1. A381390