Why is this day called so?

We celebrate 22 December as the National Mathematics Day in India as declared on 26 February 2012 by the then Prime Minister Dr. Manmohan Singh. This declaration was made at Madras University to commemorate the 125th birth anniversary of the Indian mathematical genius Srinivasa Ramanujan (22 Dec 1887- 26 Apr 1920).

Since then, this day is celebrated every 22 December with a great many events held at educational institutions and universities throughout the world to keep alive the memory of the self-taught Mathematician Srinivasa Ramanujan.

Excerpts from the PM’s speech at the 125th Birth Anniversary Celebrations of Ramanujan at Chennai

This is a section from the archive of the PM’s Speech delivered on December 26, 2011, in Chennai.

Dedicating more to him…

The foundation of the Ramanujan Math Park in Kuppam, in Chittoor, Andhra Pradesh, in 2017 augmented the day’s momentousness.
Furthermore, a Mathematics teacher Sanjiv Kumar conceptualized this park.

Excerpts from the Newspaper

This piece is from The Hindu and is dated December 27, 2011.

Correspondingly, this reminds me of the Hardy–Ramanujan number 1729

The number 1729 is called the Hardy–Ramanujan number after a popular visit by Hardy to see Ramanujan at a hospital.

I remember once going to see him when he was ill at Putney. I had ridden in taxi cab number 1729 and remarked that the number seemed to me rather a dull one, and that I hoped it was not an unfavourable omen. “No”, he replied, “it is a very interesting number; it is the smallest number expressible as the sum of two cubes in two different ways.”

~ Hardy

Before this anecdote, Hardy quoted Littlewood as saying, “Every positive integer was one of Ramanujan’s personal friends.”

The two different ways are:

Altogether, generalizations of this idea have created the notion of “taxicab numbers”.

And, A statement of Ramanujan from the movie: 
The man who knew Infinity
An equation means nothing to me unless it 
expresses a thought of God.

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