Declension table of ?dvādaśasāhasra

Masculine	Singular	Dual	Plural
Nominative	dvādaśasāhasraḥ	dvādaśasāhasrau	dvādaśasāhasrāḥ
Vocative	dvādaśasāhasra	dvādaśasāhasrau	dvādaśasāhasrāḥ
Accusative	dvādaśasāhasram	dvādaśasāhasrau	dvādaśasāhasrān
Instrumental	dvādaśasāhasreṇa	dvādaśasāhasrābhyām	dvādaśasāhasraiḥ dvādaśasāhasrebhiḥ
Dative	dvādaśasāhasrāya	dvādaśasāhasrābhyām	dvādaśasāhasrebhyaḥ
Ablative	dvādaśasāhasrāt	dvādaśasāhasrābhyām	dvādaśasāhasrebhyaḥ
Genitive	dvādaśasāhasrasya	dvādaśasāhasrayoḥ	dvādaśasāhasrāṇām
Locative	dvādaśasāhasre	dvādaśasāhasrayoḥ	dvādaśasāhasreṣu

Compound dvādaśasāhasra -

Adverb -dvādaśasāhasram -dvādaśasāhasrāt