Declension table of ?arkatva

Neuter	Singular	Dual	Plural
Nominative	arkatvam	arkatve	arkatvāni
Vocative	arkatva	arkatve	arkatvāni
Accusative	arkatvam	arkatve	arkatvāni
Instrumental	arkatvena	arkatvābhyām	arkatvaiḥ
Dative	arkatvāya	arkatvābhyām	arkatvebhyaḥ
Ablative	arkatvāt	arkatvābhyām	arkatvebhyaḥ
Genitive	arkatvasya	arkatvayoḥ	arkatvānām
Locative	arkatve	arkatvayoḥ	arkatveṣu

Compound arkatva -

Adverb -arkatvam -arkatvāt