Properties of the Number 20121

Twenty Thousand One Hundred Twenty-One

Basics

Value: 20120 → 20121 → 20122

Parity: odd

Prime: No

Previous Prime: 20117

Next Prime: 20123

Digit Sum: 6

Digital Root: 6

Palindrome: No

Factorization: 3 × 19 × 353

Divisors: 1, 3, 19, 57, 353, 1059, 6707, 20121

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

4823 Try Today's Challenge

Representations

Binary: 100111010011001

Octal: 47231

Duodecimal: B789

Hexadecimal: 4e99

Square: 404854641

Square Root: 141.84851074297538

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

4-Smith numbers. A103125

Ternary emirpimes. A119684

Number of 2 X 2 matrices with all elements in {-n,..,0,..,n} with permanent = determinant·n. A280407

Let C(n) = product of composite numbers between the n-th prime and (n+1)-th prime; a(n) = floor(C(n+1)/C(n)). A73836

Numbers k such that k![4] - 32 is prime, where k![4] = A007662(k) = quadruple factorial. A329167

Expansion of e.g.f. (1/6!)*sin⁶(x)/cos(x) (coefficients of even powers only). A278195

Ceiling of γ(n+4/7)/γ(4/7). A20121

Negasemiternary (or NST) representation of the unit ambinumber (0,1). A355912

T(1, c) = prime(c). T(r + 1, c) = (T(r, c') + T(r, c'+1)) / 2 where c' is the c-th number such that T(r, c') + T(r, c'+1) is even. Table for T read downwards by antidiagonals. A287943