Properties of the Number -1021

Twenty-One

Basics

Value: -1022 → -1021 → -1020

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 4

Digital Root: 4

Palindrome: No

Factorization: 1021

Divisors: 1, 1021

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -1111111101

Octal: -1775

Duodecimal: -711

Hexadecimal: -3fd

Square: 1042441

Square Root: 31.953090617340916

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

5th differences of partition numbers A000041. A81095

Square array A(n, k) = A329644(prime(n)^k), read by falling antidiagonals: (1,1), (1,2), (2,1), (1,3), (2,2), (3,1), ... A329637

Expansion of 1/(1-2·x+x²+2·x³). A77942

Deficiency of squares: a(n) = 2n² - σ(n²). A377879

Expansion of 1/(1+2·x+x²-2·x³). A77989

a(0)=1. a(n)= -2^n-1-3*(-1)ⁿ, n>1. A156067

Expansion of 1 - x*(1+x)/(1 + x²*(1-x²)/(1 - x³*(1+x³)/(1 + x⁴*(1-x⁴)/(1 - x⁵*(1+x⁵)/(1 - ...))))), a continued fraction. A291200

The Worpitzky transform of the squares. A344920

Numerators of coefficients in Taylor series expansion of log(cosec(x)*tanh(x)). A12860

First differences of number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 99", based on the 5-celled von Neumann neighborhood. A270159