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GW190521 is the first confident observation of a binary black hole mergerwith total mass $M > 100\,\mathrm{M}_{\odot}$. Given the lack of observationalconstraints at these masses, we analyze GW190521 considering two differentpriors for the binary's masses: uniform in mass ratio and source-frame totalmass, and uniform in source-frame component masses. For the uniform inmass-ratio prior, we find that the component masses are $m_1^{\mathrm{src}} =168_{-61}^{+15}\,\mathrm{M}_{\odot}$ and $m_2^{\mathrm{src}} =16_{-3}^{+33}\,\mathrm{M}_{\odot}$. The uniform in component-mass prior yieldsa bimodal posterior distribution. There is a low-mass-ratio mode ($q<4$) with$m_1^{\mathrm{src}} = 100_{-18}^{+17}\,\mathrm{M}_{\odot}$ and$m_2^{\mathrm{src}} = 57_{-16}^{+17}\,\mathrm{M}_{\odot}$ and a high-mass-ratiomode ($q\geq4$) with $m_1^{\mathrm{src}} = 166_{-35}^{+16}\,\mathrm{M}_{\odot}$and $m_2^{\mathrm{src}} = 16_{-3}^{+14}\,\mathrm{M}_{\odot}$. Although the twomodes have nearly equal posterior probability, the maximum-likelihoodparameters are in the high-mass ratio mode, with $m_1^{\rm src} =171\,M_{\odot}$ and $m_2^{\rm src} = 16\,M_{\odot}$, and a signal-to-noiseratio of $16$. These results are consistent with the proposed "mass gap"produced by pair-instability in supernova. Our results differ from thosepublished in Abbott et al. (2020b). We find that a combination of the priorused and the constraints applied may have prevented that analysis from samplingthe high-mass-ratio mode. An accretion flare in AGN J124942.3+344929 wasobserved in possible coincidence with GW190521 by the Zwicky Transient Facility(ZTF). We report parameters assuming a common origin; however, the spatialagreement of GW190521 and the EM flare alone does not provide convincingevidence for the association ($\ln\mathcal{B} \gtrsim -4$).

GW190521 may be an intermediate mass ratio inspiral