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Properties of the Number -21638

Twenty-One Thousand Six Hundred Thirty-Eight

Basics

Value: -21639 → -21638 → -21637

Parity: even

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 20

Digital Root: 2

Palindrome: No

Factorization: 2 × 31 × 349

Divisors: 1, 2, 31, 62, 349, 698, 10819, 21638

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

5184 Try Today's Challenge

Representations

Binary: -101010010000110

Octal: -52206

Duodecimal: -10632

Hexadecimal: -5486

Square: 468203044

Square Root: 147.09860638360922

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

Numbers k such that (7·10k + 71)/3 is prime. A270831
a(n) = ∑d∣n p(d), where p(d) = A000041 = number of partitions of d. A47968
Number of partitions of partitions of n where all partitions have the same sum. A305551
Twice-partitioned numbers where the first partition is constant. A279787
Number of ways to split an integer partition of n into consecutive subsequences with equal sums. A317715
Number of non-isomorphic set multipartitions of weight n in which all parts have the same size. A306018
a(n) = 1 + (number of partitions of n, n>0). A52810
Irregular table read by rows: T(n,k) is the number of permutations in Sn that have exactly k occurrences of the pattern 2413. 0 <= k <= A342854(n). A342860
Number of rectangular twice-partitions of n of type (P,R,P). A358833
Number of series-reduced planted achiral trees whose leaves span an initial interval of positive integers appearing with multiplicities an integer partition of n. A317099