Openssl RSA key size

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I've generated an RSA key by this command:

openssl genpkey -algorithm RSA -out private_key.pem -pkeyopt rsa_keygen_bits:2048

I exported the key to DER format, which is the binary form. The key is a waaay more than 2k bits. For test, I exported the public key to DER format, which is slightly more than 2k bits.

So the question, what is 2048 bits? How can I get the raw bits from the generated file?

Thanks, Lev

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