Chaining mode, such as ECB, does not make sense for RSA if you are not mistaken.
ECB is designed for block ciphers: input data is divided into blocks of equal size, and each block is encrypted separately. This causes some drawbacks, so it is best to avoid ECB mode for block ciphers.
RSA . , RSA : 1024- RSA- ( ) 117 , 128- .
, , 117 ( ) RSA- , , - , , , , , , . , , , "RSA/ECB/PKCS1Padding", , (ECB) ( , Java, ).
, RSA, : , RSA-, (, 16 ), (, AES) . ( ), ( , , , RSA).