I believe the exact number is 353 of which at least 3 must be Apostles, 3 Doctors of the Church, 20 must have been notable missionaries, 8 the founders of religious orders, 17 dogmatic theologians, 13 sainted pontiffs, and 25 devoted to works of charity. The remaining may be divided up in the ratio 1:1:5:3:2:2:2 among bishop confessors, bishop martyrs, martyrs, confessors, virgins, virgin martyrs and holy women .The existence of no more than 1/5 may be established on the singular basis of unreliable acta or by sermons of other saints, while for the rest it is necessary that their existence be authentically determined. More than 1/9 may not come form the same religious order and no more than 1/12 from the same geographic location, defined as 30 leagues from any major city that possess a cathedral, basilica or collegiate church. hould such edifices be lacking in the territory, then the distance is 75 leagues from any city held major by common estimation of those in the region.
The holy Virgin together with St. John the Baptist and St. Joseph refrain from interfering and thus cannot be invoked save by reliable and attested means in the deposit of public revelation. Apparitions do not count as, being private revelation, they cannot be used.