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It is available on Playstore, but do not download your wallets from Playstore, it is recommended you download Electrum from the original website, and this is the link to it:
https://electrum.org/~
You simply download Electrum from the original website and install it. If you only have a mobile device, then you have to buy a hardware wallet, so you store your funds offline and in a safe environment.
Can you redirect me to the original website of Electrum, I don't want to end up downloading a fake and end up losing that bitcoin for nothing. I'm not really sure about the first website that pops up when I search "Electrum wallet" on Google.