10100

10100 commonly denotes the decimal integer ten thousand one hundred. It lies between 10,099 and 10,101 in the natural number sequence.

Mathematically, 10100 is a composite number with prime factorization 2^2 × 5^2 × 101. It is divisible by 4, 5, 10, 20, 25, 50, 100, and 101, among other divisors. The sum of its digits is 1 + 0 + 1 + 0 + 0 = 2, so the number is divisible by 2 and is therefore a Harshad (or Niven) number in base 10. An interesting property is that 10100 equals the sum of the first 100 even numbers: 100 × 101 = 10100.

In different numeral bases, the same string of digits represents different values. For example, 10100 in base 2 equals 20 in decimal, because 1×2^4 + 0×2^3 + 1×2^2 + 0×2^1 + 0 = 16 + 4. In base 3, 10100_3 equals 90 (1×3^4 + 0×3^3 + 1×3^2 + 0×3 + 0 = 81 + 9). In base 8, 10100_8 equals 4160 (1×8^4 + 0×8^3 + 1×8^2 + 0×8 + 0 = 4096 + 64).

As a general numeral, 10100 does not denote a widely recognized constant or date beyond its basic arithmetic properties; it is primarily notable for its factorization and base-related representations.