Declension table of ?prayātavya

Neuter	Singular	Dual	Plural
Nominative	prayātavyam	prayātavye	prayātavyāni
Vocative	prayātavya	prayātavye	prayātavyāni
Accusative	prayātavyam	prayātavye	prayātavyāni
Instrumental	prayātavyena	prayātavyābhyām	prayātavyaiḥ
Dative	prayātavyāya	prayātavyābhyām	prayātavyebhyaḥ
Ablative	prayātavyāt	prayātavyābhyām	prayātavyebhyaḥ
Genitive	prayātavyasya	prayātavyayoḥ	prayātavyānām
Locative	prayātavye	prayātavyayoḥ	prayātavyeṣu

Compound prayātavya -

Adverb -prayātavyam -prayātavyāt