Declension table of ?pratyayatva

Neuter	Singular	Dual	Plural
Nominative	pratyayatvam	pratyayatve	pratyayatvāni
Vocative	pratyayatva	pratyayatve	pratyayatvāni
Accusative	pratyayatvam	pratyayatve	pratyayatvāni
Instrumental	pratyayatvena	pratyayatvābhyām	pratyayatvaiḥ
Dative	pratyayatvāya	pratyayatvābhyām	pratyayatvebhyaḥ
Ablative	pratyayatvāt	pratyayatvābhyām	pratyayatvebhyaḥ
Genitive	pratyayatvasya	pratyayatvayoḥ	pratyayatvānām
Locative	pratyayatve	pratyayatvayoḥ	pratyayatveṣu

Compound pratyayatva -

Adverb -pratyayatvam -pratyayatvāt