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Properties of the Number 21248

Twenty-One Thousand Two Hundred Forty-Eight

Basics

Value: 21247 → 21248 → 21249

Parity: even

Prime: No

Previous Prime: 21247

Next Prime: 21269

Digit Sum: 17

Digital Root: 8

Palindrome: No

Factorization: 2 8 × 83

Divisors: 1, 2, 4, 8, 16, 32, 64, 83, 128, 166

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2730 Try Today's Challenge

Representations

Binary: 101001100000000

Octal: 51400

Duodecimal: 10368

Hexadecimal: 5300

Square: 451477504

Square Root: 145.7669372663088

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

Triangle T(n, k) = T(n-1, k) + T(n-1, k-1) + 11·T(n-2, k-1), read by rows. A153521
Products of the 8th power of a prime and a distinct prime (p8*q). A179668
T(n,k)=Number of nXk 0..3 arrays x(i,j) with each element horizontally, diagonally or antidiagonally next to at least one element with value (x(i,j)+1) mod 4 and at least one element with value (x(i,j)-1) mod 4, no adjacent elements equal, and upper left element zero. A231049
Triangle T(n,k) whose k-th column is the k-fold self-convolution of the primes; triangle T(n,k), n>=0, 0<=k<=n, read by rows. A340991
Values of n such that there are exactly 7 solutions to x2 - y2 = n with x > y >= 0. A257414
Number of partitions of n such that the number of parts having multiplicity 1 is a part and the number of distinct parts is a part. A241442
G.f.: A(x) = ∑n>=0 binomial(3*(n+1), n)/(n+1) * xn / (1+x)2*(n+1). A316371
Row sums of inverse of sequence array for Euler φ function. A106480
Triangle of coefficients of polynomials v(n,x) jointly generated with A207629; see the Formula section. A207630
Numbers n such that A048720(n, A065621(n)) is a perfect square, but n is not in A023758. A277807