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Properties of the Number 21135

Twenty-One Thousand One Hundred Thirty-Five

Basics

Value: 21134 → 21135 → 21136

Parity: odd

Prime: No

Previous Prime: 21121

Next Prime: 21139

Digit Sum: 12

Digital Root: 3

Palindrome: No

Factorization: 3 × 5 × 1409

Divisors: 1, 3, 5, 15, 1409, 4227, 7045, 21135

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101001010001111

Octal: 51217

Duodecimal: 10293

Hexadecimal: 528f

Square: 446688225

Square Root: 145.37881551312762

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

Terms in A112039 that are divisible by 3, divided by 3. A112040
Number of subsets of {1,2,...,n} whose sum is semiprime (cf. A001358, A064911). A181522
Anagraprod Integers. Integers N that reproduce their multiset of digits when all the products of two successive digits of N are done (and considered together). A296451
Numbers n with property that for each single digit d of n, we can also see the decimal expansion of the d-th prime as a substring of n. Also n may not contain any zero digits. A135015
Number of disconnected simple graphs on n vertices with each component regular. A165648
Potential magic constants of 9 X 9 magic squares composed of consecutive primes. A191679
T(n, k) = (1/n) * ∑d∣n φ(d) * A241171(n/d, k) for n >= 1, T(0, k) = 0k. Triangle read by rows for 0 <= k <= n. A327027
Numbers k such that k divides the sum of the digits of k2k. A108859
Number of (n+2) X (5+2) 0..3 arrays with every 3 X 3 subblock row and diagonal sum equal to 0 3 5 6 or 7 and every 3 X 3 column and antidiagonal sum not equal to 0 3 5 6 or 7. A252381
Decimal expansion of 1/131. A21135