210×1

210×1 is the product of the integers 210 and 1, and its value is 210. In basic arithmetic, multiplying a number by 1 leaves the number unchanged, and 1 is the multiplicative identity.

The number 210 has several notable properties. Its prime factorization is 2 × 3 × 5 × 7, the product of the first four primes. 210 is a triangular number, specifically T20, since 20×21/2 equals 210. The positive divisors of 210 are 1, 2, 3, 5, 6, 7, 10, 14, 15, 21, 30, 35, 42, 70, 105, and 210, which makes 16 divisors in total. The Euler totient of 210 is φ(210) = 48.

In mathematical practice, the expression 210×1 is commonly used to illustrate the identity property of multiplication in learning contexts and to reinforce the concept that multiplying by one does not change a value. Beyond its role in simple arithmetic, 210 appears in various number-theoretic and combinatorial contexts due to its factorization and triangular nature.