An estimation of the number of cells in the human body = 37.2 trillion

An estimation of the number of cells in the human body = 37.2 trillion 

https://pubmed.ncbi.nlm.nih.gov/23829164/

Results: A current estimation of human total cell number calculated for a variety of organs and cell types is presented. These partial data correspond to a total number of 3.72 × 10^13. Or 37.2 trillion 

One trillion is also known as 10 to the power of 12. That's, one trillion is

1,000,000,000,000.

Conclusions: Knowing the total cell number of the human body as well as of individual organs is important from a cultural, biological, medical and comparative modelling point of view. The presented cell count could be a starting point for a common effort to complete the total calculation.