An apostle is a Christian leader gifted, taught, commissioned, and sent by God with the authority to establish the foundational government of the church within an assigned sphere of ministry by hearing what the Spirit is saying to the churches and by setting things in order accordingly for the extension of the kingdom of God.
There is no such thing as an apostle to the whole church. God assigns to each apostle certain spheres in which they exercise authority. Paul makes this clear in 2 Corinthians 10:13-16. There he says, “We, however, will not boast beyond measure, but within the limits of the sphere which God appointed us” (2 Cor. 10:13). Apostolic spheres can be ecclesiastical, functional, territorial (geographic), cultural, or workplace.