Properties of the Number 21252

Twenty-One Thousand Two Hundred Fifty-Two

Basics

Value: 21251 → 21252 → 21253

Parity: even

Prime: No

Previous Prime: 21247

Next Prime: 21269

Digit Sum: 12

Digital Root: 3

Palindrome: No

Factorization: 2 ² × 3 × 7 × 11 × 23

Divisors: 1, 2, 3, 4, 6, 7, 11, 12, 14, 21

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101001100000100

Octal: 51404

Duodecimal: 10370

Hexadecimal: 5304

Square: 451647504

Square Root: 145.78065715313537

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) = ∑_{k = 0..n} binomial(n,k)⁴. A5260

a(n) = 2·binomial(n,4). A34827

Numbers which are divisible by prime(d) for all digits d in their decimal representation. A256786

Number of integer partitions of n with alternating product > 1. A347448

a(n) = (2/(n-1))*a(n-1) + ((n+5)/(n-1))*a(n-2) with a(0)=0 and a(1)=1. A96338

Square array A(n, k) = ∑_j=0..n binomial(n,j)^k, n >= 0, k >= 0, read by antidiagonals. A309010

Alkane (or paraffin) numbers l(8,n). A5995

Triangle read by rows: T(n,k) is the number of noncrossing trees with root degree equal to k. A92276

Array T(n,m) = 2*(2m+3)!*(4n+2m+1)!/(m!*(m+2)!*n!*(3n+2m+3)!) read by antidiagonals. A146305

Numbers that are the sum of seven fourth powers in six or more ways. A345572